Bank of America Credit Card Complaint

Bank of America Credit card department,

Identity theft / Fraud / Embezzlement California

I have master card credit card from bank of america I found transaction in my statement - for - - MI. I did not made this transaction and i did not know any thing about this merchant. I made a claim to Bank of America after that they sent me a new credit card and remove this transaction. about one month later they called me and denied my claim. I tried to describe that I did not made this transaction but they did not gave me any attention. I called them again and reactivate the claim again. after one more month they did not change the decision