unfavour billing

I went to the gym company to enquire on their service and fees and I wanted to join the gym, but I went back within 3/4 days to cancel my membership but was told that the lady that asisted me resigned and should conatct the manager. I called them the following day and was told that he was busy. I spoke to some lady who told me that I needed to make an appointment to come see the manager about cancellation, I was unhappy because of the fact that they couldn't cancel as easy as signing up clients. I called again and informed that I am officailly cancelling over the phone becuase the manager is never available, next thing 2 months later I get calls to say I owe them. I went back to offiice in jhb newgate and was told that my application was never cancelled and that i need to pay, I was very upset and informed them that i will never pay for a service that i did not use. I never even got a membreship card. I later requested a credit report and found out that I was listed for R8200. This is less than a year of them solving or cancelleing my application and suddenly I owe then R8200. I need this to be cancelled or i WILL TAKE THIS UP WITH NCR within 2days of sending this compliant.