I'll bet you that you're wrong about that.
You're wrong about that.
You are mistaken about that.
You are misunderstanding that.
That is your misunderstanding.
That is your mistake.
You are mistaken.
That is exactly as you are thinking.
You misunderstood that.
That is exactly what you are saying.
That is where you are wrong.
You are right about that.
I agree with what you are saying.
I agree with you on that.