A year + and still no reversal????

More than a year ago, an unauthorized transaction went off my account. I was told the party has 30 days to send proof of authorization, and if not the money will be reversed. Every time i went to the bank, new story.. Back lock in the department, re submitting, IT NEVER ENDS! I havent gone to check up in a while, but im tired, theres no point in trying anymore. Pls contact me and resolve this year+ long of B******T!!