MBD is incredibly unprofessional

I’ve had the most annoying experience with this company. In 2015 April I created an account with Virgin Active because they had an ongoing discount for students for their subscription. The guy who was at sales said it was R150 per month and that seemed reasonable for me and my 2 friends. So we signed up and things quickly turned sour, in the second week after signing up we were asked to pay R300 and in fact the subscription was R300. We didn’t sign the contracts and we were still being charged. The sales guy Sanele was caught out by a number of people and he fled. Now, MBD has been calling me every single day with regards to me owing R2500, they won’t leave me alone. They call me every day, twice a day. I am tired at their unprofessionalism as I’ve told them what happened numerous times and I feel I was conned into the Virgin Active account. MBD has refused to resolve this matter and I want them to stop calling me.