Amex Prepaid Card Complaint

Amex Prepaid card department,

General purpose card Unauthorized transactions/trans. issues Massachusetts

On -/-/16 i went to an ATM with my prepaid serve AME- card to withdraw $20.00 out of my account the ATM did not dispense the money it said transaction error i tried again it gave me the same message i noticed that the money was taken out of my account so i put in a dispute right away with AME- they refunded the money the next day after that on -/-/16 i received an email saying that they closed the account permanently and the remaining balance will be issued in a check by mail within 7-10 buisness days i have no access to my money i tried to resolve the issue with them but they have no answers when i call i spoke with supervisors they put me on hold and then hang up on me with no explanation as to why they closed the account