Bank of America review: Fraudulent transactions billed to my debit card

I was a victim of fraudulent transactions mounting $451 on my company debit card. I filed a complaint with the bank right when I noticed 21 purchases made on amazon on the same day, all between $15 and $30.
What made it obvious to notice it was fraudulent is the fact that I never used my company debit card for any purchase whatsoever in the course of 2 years. I stated this fact multiple times on the phone, then personally with my account manager then in a letter she asked me to send to fraud department.
After 4 months they came back saying they reached a conclusion that "no posting error has occurred on my account", meaning they found out all 21 purchases were considered legit. Now I find myself with no one to complain as the bank sent me a letter saying that the case is closed and that I will no longer be able to address it with them again, which is beyond frustrating.