Problem facing this issue 7 unable to buy item (response: 7:item already owned)

hi this is my first post, i have written below code for billing, when i was testing app i purchase all items and now i am getting this error “7 unable to buy item (response: 7:item already owned)” i am using android native plugin for this
right now my app is live please help me asap, it is some urgent help required i try to search on google alot but i could not figure this out… please help me asap.

using UnityEngine;
using UnityEngine.UI;
using UnionAssets.FLE;
using System.Collections.Generic;
using System.Collections;

public class BillingWork : MonoBehaviour {



    public const string Two_Life_PurChase = "2life";
    public const string Six_Life_PurChase = "6life";
    public const string Twelve_Life_PurChase = "12life";
    public const string Thirty_Life_PurChase = "30life";
    public const string Three_Energy_PurChase = "3energy";
    public const string Eight_Energy_PurChase = "8energy";
    public const string Eighteen_Energy_PurChase = "18energy";
    public const string Fourty_Energy_PurChase = "40energy";

    /// <summary>
    /// Consumeable
    /// </summary>

    public const string UnLockStageTwo = "cookingshow";
    public const string UnLockStageThree = "masterchef";

    private bool ListnersAdded = false;

 


    void Awake()
    {
        int billingintif = PlayerPrefs.GetInt("billingint");
        if (billingintif == 1) {
            Debug.LogWarning("billingifopen");
                        if (ListnersAdded) {
                                return;
                        }

                        AndroidInAppPurchaseManager.instance.addProduct (Two_Life_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Six_Life_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Twelve_Life_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Thirty_Life_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Three_Energy_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Eight_Energy_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Eighteen_Energy_PurChase);
                        AndroidInAppPurchaseManager.instance.addProduct (Fourty_Energy_PurChase);

                        AndroidInAppPurchaseManager.instance.addEventListener (AndroidInAppPurchaseManager.ON_PRODUCT_PURCHASED,
                                                              OnProductPurchased);
                        AndroidInAppPurchaseManager.instance.addEventListener (AndroidInAppPurchaseManager.ON_PRODUCT_CONSUMED,
                                                              OnProductConsumed);

                        AndroidInAppPurchaseManager.instance.addEventListener (AndroidInAppPurchaseManager.ON_BILLING_SETUP_FINISHED,
                                                              OnBillingConnected);
     
                        AndroidInAppPurchaseManager.instance.loadStore ();
     
                        ListnersAdded = true;
                }
     
        PlayerPrefs.SetInt("billingint", 2);
    }
    private void OnProductPurchased(CEvent e) {
        BillingResult result = e.data as BillingResult;

     
        if(result.isSuccess) {
            OnProcessingPurchasedProduct (result.purchase);
        } else {
            AndroidMessage.Create("Product Purchase Failed", result.response.ToString() + " " + result.message);
        }

    }

    private void OnProductConsumed(CEvent e) {
        BillingResult result = e.data as BillingResult;
     
        if(result.isSuccess) {
            OnProcessingConsumeProduct (result.purchase);
        } else {
            //AndroidMessage.Create("Product Cousume Failed", result.response.ToString() + " " + result.message);
        }

    }

 
    private void OnProcessingConsumeProduct(GooglePurchaseTemplate purchase) {
        switch(purchase.SKU) {

        }
    }

    private void OnBillingConnected(CEvent e) {
        BillingResult result = e.data as BillingResult;
        AndroidInAppPurchaseManager.instance.removeEventListener (AndroidInAppPurchaseManager.ON_BILLING_SETUP_FINISHED, OnBillingConnected);
     
     
        if(result.isSuccess) {
            //Store connection is Successful. Next we loading product and customer purchasing details
            AndroidInAppPurchaseManager.instance.addEventListener (AndroidInAppPurchaseManager.ON_RETRIEVE_PRODUC_FINISHED, OnRetrieveProductsFinised);
            AndroidInAppPurchaseManager.instance.retrieveProducDetails();
         
        }

    }

    private void AddLifesToGame(int AmountToAdd)
    {
        int val = PlayerPrefs.GetInt("Life",0);
        AndroidToast.ShowToastNotification ("Life: " + val);
        int finallife = val + AmountToAdd;
        PlayerPrefs.SetInt("Life",finallife);
        AndroidToast.ShowToastNotification("Final Life: " + finallife);
    }
    private void AddEnergyToGame(int AmountToAdd)
    {
        float val = PlayerPrefs.GetFloat("startenergyleft");
        float finalenergy = val + AmountToAdd;
        PlayerPrefs.SetFloat("startenergyleft",finalenergy);
    }

    private void OnProcessingPurchasedProduct(GooglePurchaseTemplate purchase) {
        //some stuff for processing product purchse. Add coins, unlock track, etc
     
        switch(purchase.SKU) {
            case Two_Life_PurChase:
                AddLifesToGame(2);
                break;
            case Six_Life_PurChase:
                AddLifesToGame(6);
                break;
            case Twelve_Life_PurChase:
                AddLifesToGame(12);
                break;
            case Thirty_Life_PurChase:
                AddLifesToGame(30);
                break;
            case Three_Energy_PurChase:
            AddEnergyToGame(3);
                break;
            case Eight_Energy_PurChase:
                AddEnergyToGame(8);
                break;
            case Eighteen_Energy_PurChase:
                AddEnergyToGame(18);
                break;
            case Fourty_Energy_PurChase:
                AddEnergyToGame(40);
                break;
            case UnLockStageTwo:
            PlayerPrefs.SetInt ("stackpayoff", 2);
                break;
            case UnLockStageThree:
            PlayerPrefs.SetInt ("stackpayoff", 3);
                break;
        }
    }

    private void OnRetrieveProductsFinised(CEvent e) {
        BillingResult result = e.data as BillingResult;
        AndroidInAppPurchaseManager.instance.removeEventListener (AndroidInAppPurchaseManager.ON_RETRIEVE_PRODUC_FINISHED, OnRetrieveProductsFinised);
     
        if(result.isSuccess) {
         
            UpdateStoreData();
         
         
        } else {
            //AndroidMessage.Create("Connection Responce", result.response.ToString() + " " + result.message);
        }
     
    }
 
    public void scorescene()
    {
        Application.LoadLevel ("score");

        }
    public void TwoLife()
    {
        AndroidToast.ShowToastNotification("Purchasing Two Life");
        purchase (Two_Life_PurChase);
    }
    public void SixLife()
    {
        purchase (Six_Life_PurChase);
    }
    public void TwelveLife()
    {
        purchase (Twelve_Life_PurChase);
    }
    public void ThirtyLife()
    {
        purchase (Thirty_Life_PurChase);
    }
    public void ThreeEnergyPurChase()
    {
        purchase (Three_Energy_PurChase);
    }
    public void EightEnergyPurChase()
    {
        purchase (Eight_Energy_PurChase);
    }
    public void EighteenEnergyPurChase()
    {
        purchase (Eighteen_Energy_PurChase);
    }
    public void FourtyEnergyPurChase()
    {
        purchase (Fourty_Energy_PurChase);
    }
    public void UnLockLevel()
    {
        int stageVal = PlayerPrefs.GetInt ("stackpayoff", 1);
        if(stageVal == 1)
        {
            purchase(UnLockStageTwo);
        }
        else if(stageVal == 2)
        {
            purchase(UnLockStageThree);
        }
    }

    private void purchase(string SKU) {
        Debug.LogWarning (SKU);
        AndroidInAppPurchaseManager.instance.purchase (SKU);
    }
 
    private void consume(string SKU) {
        AndroidInAppPurchaseManager.instance.consume (SKU);
    }
 
    private void UpdateStoreData() {
     
        foreach(GoogleProductTemplate p in AndroidInAppPurchaseManager.instance.inventory.products) {
            Debug.Log("Loaded product: " + p.title);
        }
     
        //chisking if we already own some consuamble product but forget to consume those
        if(AndroidInAppPurchaseManager.instance.inventory.IsProductPurchased(UnLockStageTwo)) {
            consume(UnLockStageTwo);
            PlayerPrefs.SetInt("stackpayoff",2);
        }
        else if(AndroidInAppPurchaseManager.instance.inventory.IsProductPurchased(UnLockStageThree)) {
            consume(UnLockStageThree);
            PlayerPrefs.SetInt("stackpayoff",3);
        }
     
        //Check if non-consumable rpduct was purchased, but we do not have local data for it.
        //It can heppens if game was reinstalled or download on oher device
        //This is replacment for restore purchase fnunctionality on IOS
     

    }
}

Please use code tags:

Done thank you…
can anyone please help me in this.

there is no one who can help me with this ?

still looking for some help… anyone please…