Unwanted account

I am very angry and unhappy how the sales person from virgin active toke my details and opened an account that I didn't approve of..when I asked him. He came with a foreign white guy to me and told me I must not worry the guy will pay it. I didn't agree he kept on running away from me..next thing I know. The MBD people call me to tell me my virgin active account is in debt and I am blacklisted. I have never went to the gym even once.I don't know how am I gonna even pay this money and iv never been to virgin active before. I am very upset. And he has disappeared ..This kagiso guy must be stopped maybe he does it to alot of people..