unauthorised debit order

I have been a victim of ***** by a Virgin active sales consultant just for the sake of a sale. A sales consultant by the name of Brendon encouraged my husband to forge my signature as the offer was ending on that very day. He offered him 4 free months thereafter R450 on a two year contract. My husband thereafter became ill and was unable to train and did not think about putting in my bank account that I no longer use as he was promised 4 months free. A few months later now my family members and I have been receiving calls from mbd debt collection so state that I am now blacklisted for not making payment to my contract. I have never been to any Virgin active gym before, he then got in contact with Brendon and he said he will sort it out which he did not . His manager Tharish then got involved and asked me for emails n then a letter from my bank to state it is not a joint account I did as they said because I didn't want to get blacklisted for something I never agreed to nor did I sign any documents .We were also told that there was no such offer of 4 free months when there was another sales consultant who was a witness to what Brendon said at point of sale he told my husband that if he don't take the offer today and sign the documents he won't get the special deal of 4 months free. Tharish said he will resolve it if I send the letter from my bank n mbd will stop calling me and my name will be cleared however till date is has not been resolved it's now 40days and I'm still receiving calls stating I need to pay for something I never signed. I will never recommend anyone to take a contract with Virgin active if they could ***** on my account just for a sale just imagine what they could do with everyone else's details.