Vodacom updgraded my line without my consent.

I called vodacom cancelation department to cancel my contract at the end of July. The consultant insisted that I upgrade my contract and I told him that I won't be upgrading since I am not using that line and have two other contracts that I'm paying for with vodacom. We eventually agreed that my line will be switched over to prepaid as of the 1st August. I was shocked month end to find out that the line was upgraded without my permission. Worse, vodacom continued to charge me for the line until October even when I constantly concted them (from August) to stop the line. The worst of it is that the same thing happened in 2007 when vodacom opened another line without my consent and when I enquired about it I later was told that there's no information about it. The best vodacom can do is to cancel the but I never reimbursed.

I want vodacom to pay me for the three months I paid for a line I did not use.