Amex Prepaid Card Complaint

Amex Prepaid card department,

Transit card Managing, opening, or closing account North Carolina

American Express Serve provided a free $50.00 Card when purchasing an iPhone at -. I used the money the same day and called several times to close the account. I was told the account was closed after dozens of hours and nearly a year later. Months later, I started getting emails that they now charge a $4.00 monthly fee and I now owe money on the card. I ca n't get them to close my account after trying many times for the past year.