unauthorised billing

I joined Gym company in Nov 2016.i cancelled the contract with them the next day and it was stated in the contract that you need to to cancel the contract within 5 working days if u don't want it anymore.I went to their branch in Florida,spoke to the manager and he understood why I wanted to cancel the contract. In January 2016 they have deducted the money into my account and i reversed it twice in Jan.i thought because I reversed the money they will leave me in peace.this month again they got into my account and deducted, I reversed the money again.i really don't know what they want me to do because I have cancelled the contract. Now I'm scared of leaving the money into my account because they will deduct it.