YouFit incompetent staff; no recourse in their mistakes. Tallahassee Florida

I am former customer at YouFit located in Tallahassee, FL on Mahan Drive.I am writing to dispute some charges.  However, the problem goes further than a mere dispute about some charges. I went to the Mahan branch, cancelled by son's membership. I asked three times whether this was indeed a cancellation. I was assured that it was.  I found out 8 months later that I had been continuously charged. I found that I was false reassured that I had indeed cancelled my son's membership. The person at the gym did not inform me that there was a $10 cancellation. Because of that omission by the clerk, I was continuing charged for 8 months.  I was next told that I could not cancel unless I paid the three months that I owed. Of course, the entire problem came to light because Costco had changed credit cards and the charge was no longer hidden in the overall bill.  I paid the past $49.26 and $10 cancellation fee so that I wouldn't keep getting charged.