Unit Ads- Invalid Activity Policy

HI,
I am new here on unity ads. I have communication Android app and am monetising unity ads with Mopub mediation on the app but My account bloecked by Unity saying that " Invalid Activity Policy ". So please help me how can I restrict some users that they might be clicking on ads or any others ways so that i can avoid this policy violations.

thanks.

Hi,

If you get in touch with our support email, we can review this for you:
unityads-support@unity3d.com

Thanks