Problem with reflection against rigidbody

I have an object that moves based on AddRelativeForce in a given direction. The object changes direction slightly and the force is added via FixedUpdate(). Now, I want to make this object change direction when it hits a wall. Put shortly, I want the object to change direction in a way that perfectly mirrors the direction of the collision, like this.
The FixedUpdate() function would take care of moving the object in this new direction.

So far, I have this code:

private int count;
public int moveSpeed = 500;
public float maxVelocity = 10.0f;
private float lookSpeed = 15.0f;
// rotation variables
private float rotationX = 0.0f;
private float rotationY = 0.0f;

void Start () 
{
	count = 0;
}

void FixedUpdate () 
{
	//alter direction slightly every 5 counts
	if (count == 5) 
	{
		rotationX += Random.Range (-0.2f, 0.2f) * lookSpeed;
		rotationY += Random.Range (-0.2f, 0.2f) * lookSpeed;
		rotationY = Mathf.Clamp (rotationY, -90, 90);

		transform.localRotation = Quaternion.AngleAxis (rotationX, Vector3.up);
		transform.localRotation *= Quaternion.AngleAxis (rotationY, Vector3.left);

		count = 0;
	}

	count++;

	//apply force in given direction, with limit
	if (rigidbody.velocity.magnitude > maxVelocity)
	{
		rigidbody.velocity = rigidbody.velocity.normalized * maxVelocity;
	}	
	
	rigidbody.AddRelativeForce(moveSpeed * Vector3.forward);
}

//reflect off wall
void OnCollisionEnter(Collision collision)
{
	if (collision.collider.tag == "wall") {
		ContactPoint hit = collision.contacts[0];
		Vector3 reflection = Vector3.Reflect (rigidbody.velocity, hit.normal);
		rotationX = reflection.x;
		rotationY = reflection.y;
	}
}

As it stands, however, the object tends to turn in the direction of the object it is colliding with. i.e.: it’s running right into it.

Is there something wrong with my code?

Thanks in advance!

try this Bounce Reflection