Amex Prepaid Card Complaint

Amex Prepaid card department,

General purpose card Unauthorized transactions/trans. issues Texas

After an initial complaint regarding an unauthorized transaction on my son 's family - card that created a negative balance which was rolled into my account, AmEx issued a " provisional credit '' pending the outcome of their investigation. Their letter dated -/-/2016 stated if their investigation found in favor of the vendor, the credit would be reversed - which it was on -/-/2016 - leaving a new negative balance, I believe AmEx only issued the credit to stop the CFPB and - response clocks. Since there was noresolution, this is a new clock and now includes the FBI - - -. AmEx wants me to make a deposit to remedy the negative balance ; but the vendor ( - - ) that AmEx claims they found in favor of has no record of the transaction. How is it possible I can be held liable for a transaction I did not initiate and the vendor has no record of receiving? A subsequent conversation with the vendor, their card processor ( - ) and AmEx resulted in the same run-around tactics I 've dealt with since my original call to AmEx. I do n't owe them money, but they have debited $980.00 from my account ( $490.00 - - ) Please help me get to the bottom of this.