Contract *****

I am prepaid client with vodacom for over 9 years. On 27th February I noted all incomming calls were not displaying the caller id. Unable to figure out the problem I went to vodashop and after attempting to check my phone settings they told me, oh your phone is on contract and you need to contact the call centre to activate the caller id. I was shocked as I had not requested vodacom or any other party in that case for a contract. After the initial shock I told them to cancel that contract immediately as it is a *****, they said I call the call centre. That night I called the call centre and the game of muscical chair began, I was sent from one department to another. I was told to call cancellation and after to call RMCS. RMCS is not a free call and I was put on phone music taking up airtime recharge and phone not answered. I went to vodaworld in midrand, the agent said he is not able to cancel the contract but will escalate my request. He said vodacom will call me within 24 hours with to confirm actioned. Now is 2weeks since I made the request to cancel, vodacom has not attempted to contact me. I have called the call centre several times, every time I am told request is pending