Opened two accounts in my name at same time

This company erroneously started two accounts in my name back in 2009. I wrote in cancelling both accounts when they told me they had made the mistake. However, they only cancelled one. Come their sale to LA Fitness I get a letter in the mail saying my account is being transferred to LA Fitness. I haven't lived within a 100 miles of a Bally's in over two years! Of course, they have since lost my cancellation letter that listed both accounts. They charged me over $200 in one sum last year! I am a body builder and feel like this gym completely robbed me. Terrible experience.