FAILING TO CANCEL CONTRACT & STOP DEBITING MY ACC

My contract expired in October 2014, I sent email to planet fitness and even went to the branch for assistant to cancel the contract and stop debitting my account, but no one is assisting me. The planet fitness change the reference number and deduct the money on my bank account whenever and the amount they want. I am going to report this matter to the National Consumer Commission. I have to go to the bank every month to reverse the payment and I don't have time for this nonsense.