Unauthorised activation - double billed.

I cancelled an old decoder in writing at the N1 city Multichoice,, as it was never removed from my name. I then activated a new dual view decoder. two months later we were charged double, and again the month after that. I then went to into N1 city to ask for an explanation. I eventually got to the supervisor who basically told me that another person reactivated the old decoder, (without my permission, after I had cancelled it in writing) and because they weren't paying for it, I was charged, she went on to say that I have no recourse with DSTV, and I must get my money back from the individual who activated my account. Firstly its against the consumer protection act to allow for a third party to open/activate an account in my name, dstv did not contact me for verification, and now that I let them know of their fault, they charged me pro rata for the outstanding balance on the account. I have therefore not paid, and will not pay them until Multichoice acknowledges their fault, and credit me for funds taken. I will escalate this to the ombudsman if no constructive response is received.