My account has been banned for no reason, please check it because I need to play batlefield 4 again with my friends ...

I paid for this account and I do not use hack, I have the right to claim because this is unfair, what proof? where am i playing and using hack? What is the real reason why I get banned and can't play online? What does this really mean? Where is the proof that I used hack, aimbot or whatever?