Inaccurate records/*****

I have recently signed a contract with Virgin Active for a 3rd time and upon sign up I was told of an amount outstanding, this amount was outstanding more than 3 years ago. Firstly it makes no sense as to how I was able to sign up a 2nd time if that amount was still due so obviously it was paid off or written off as I would not be able to continue at the gym with a new contract if it were not. Upon my 3rd time with them they brought up the amount that was owing and after querying it they agreed to write it off and sign me up for a 3rd time. Days later I get a call requesting an amount of R1500 which was not agreed on, they say they have call recordings notifying me etc but honestly who remembers what was spent 3 years ago and even if I did pay it off I can't trust Virgin active as they are not able to keep records accurately or adhere to processes as they constantly change their agreements. I have signed up and paid my joining fee and all I want to do is use the gym peacefully. I am going to post this on their Facebook page, their twitter and any correspondence I can because it seems as if this gym only caters to the rich and people of a certain race,