being charged for no service

l met a group of your salespersons in Durban station in front of Cambridge supermarket. they asked me to join I told them I cant because I just finished matric, I am not working and I am a full time student at ukzn Westville campus. one told me that I wont have to pay a penny if I don't use you services but I am surprised that every month I must pay R200 now I am owing R839.i am surprised because I didn't even set my foot in one of your gyms and they didn't even tell me where am I supposed to go as I am staying in Westville meaning the nearest branch I must go to. l even asked several times that if I don't pay as l wont be using your services wont I get in trouble with the gym? a lady said I don't have to pay for something that I don't use at all they all assured me that. so please cancel my membership from your books