Bank of America Bank Account Or Service Complaint

Bank of America Bank account or service department,

Checking account Using a debit or ATM card Massachusetts

In - I was vacationing in - - - -. I experience identity theft and my account was charged almost $600.00 I filed my fraud claim with Bank of America and they came back and said because I had made purchases the same day the fraud had occurred with the same merchant the frauduelent vendor had also used that they are unable to determine if any fraud has occurred. This is why we sign receipts, the bank is not doing their due diligence and im out $600.00. Because every vendor in - uses the same merchant that should n't be my problem. Please help