Virgin Active unfair Contract

I tried to join Virgin Active last year February. I filled the Form at Sunnyside Baclay square, the virgin Active team was working there. I filled in the form and they gave me a card. The following day I was called buy the guy who was assisting me and said to me that I have cancelled somewhere on the form they wont process it until I sign next to were I cancelled. I waited for the guy to come but he did come. So in my mind I thought that I do not have contract with them since they said they wont process it until I sign and I didn't even bother to go the gym. To my surprise I was called last year September to say that I owe Virgin Active. I explained to the lady who called me and she said she will look in to it and come back to me. I waited and she did not. I called virgin Active hadfield and explained to them what happened they guy I spoke to said to me that the guy who assisted me is no longer working there so they can't assist me. As I was trying to explain he hanged the phone. Until I received a call from MBD telling me to pay virgin Active. At first I did not agree because I could pay for something that I dont benefit from. The lady said to me that I should pay and they will allow me to use the Virgin Active benefits. To my surprise still they say my account is blocked. The only reason I kept on paying is because I did not want to ruin my credit record. Can someone help me please as I cannot continue to pay for nothing.