Pathetic service for contract cancellation

I called vodacom in November 2015 to cancel my contract that was due for an upgrade. In December 2015 i called to query why my contract was not cancelled as instructed by myself. I was told that someone would get back to me the next day. Since then i received smses that my query had been escalated to a service specialist but still have not received feedback. I called again yesterday and was on the phone with vodacom for over 2 hours and still no joy and solution as to why my contract was not cancelled. The consultants kept transferring me from one department to another and also deliberately cut me off. I need this matter to be resolved and all monies that were deducted from my account to be returned or i will take this matter further.