Zone fitness not so reliable after all

I want to inform Zonefitness that I want my money back because they assured me that I would not be debited as my contract has been canceled. I made sure that I enquired about the contract validity ahead of time so that I don't get this run around. I was promised not to worry, I won't be debited but ever since I enquired this company has been trying to debit my account and I notified them, again it was said don't worry about it. Until the 14th of May my account was debit with a higher amount than what I was paying. It is not my duty to inform your accounts department because I already did my due diligence on informing you that I will no longer continue with the contract, I have completed my 24 months in full. Pay back my money with immediate effect.