Mis sale once again!

On the 8th of March i went to gym then the sales guy by the name of OKO approached me and offered me a booster pack of R599.00. He then assisted me to go in online and do the purchase i told him the next day that i can no longer afford it and i want to cancel it he assured me that he will add notes to the system for this to be removed that should i be charged i should just reverse it, i have called and even went to the club to have this sorted i was told that the manager will have a word with him today to confirm this and i still do not have feedback.The R599 is still owing on my account i am not happy at all with this as it is not the first time i had a complaint when i was signing up and the sales man put me on a plan he wanted which is more expensive and did not explain this, I am not happy at all how do they charge me when i did not even recieve the services of that R599? i need this removed from my account as soon as possible!!! Your sales team should not sell lies to customers he assured me that i can cancel now its stuck on my name!!!.