Seller account deactivated for no reason

My account was deactivated, they say I have another account I have to prove that I dont have a second account. How am i supposed to prove that if I dont have a second account with documents ? My account is new, I was about to ship my first order to fba, and they deactivated my account. They are asking for documents to prove that I dont have a second account, but I dont know how to prove that! Please help.