Put onto incorrect package without my knowledge

I am a client with 6 contracts on my name, one of my contracts expired in December 2015 ***). I contacted the call centre and went through to cancellations. I told the call centre agent that I want to cancel my contract. He then asked me if I wanted to go onto prepaid & I confirmed. At that point I thought all was sorted only to find out later that evening that I was put onto another contract without my express permission. I am now trying to get this resolved since Saturday and it seems I am being given the runaround because nobody at the Call Centre can get this resolved. This is unacceptable as I have been duped onto a contract that I did not request and would like to get this resolved as soon as possible. I need someone from Vodacom to contact me, I will like to state I do not want to talk to anyone from the call centre as they are not equipped to resolve problems.