Gym Company Flora Centre Overdeduction Theft

I've had endless problems with overdeductions from my bank account on 3 three year contracts that I had with Gym Company. I've hardly used the gym because my family and I were continuously harassed in the Flora centre branch, where I signed us all up to join 3 years ago. I ensured that I wrote a letter a month before the contracts were due to end. I completed the necessary forms. Gym Company still persists in deducting from my bank account which affects my credit history now. This is not a good business to sign up with.