Amazon account deactivated due to alleged links with another account

Hi

My Amazon uk account has been deactivated for alleged links to another account which belongs to by brother. His account was deactivated for reasons I am not aware of as he is a totally separate entity. Either he accesses his account through my laptop or I might have entered his address by mistake which led to this deactivation. Amazon is asking for proof. I don’t know how to prove that his account is not my account. This is the truth.