UPGRADING CONTRACT WITHOUT MY CONSENT

I was contacted on 21 October 2012 by Nurroenisa Solomons from CellC's Head Office in Cape Town . I was told because I was a loyal customer, CellC would like to offer me an early upgrade on one of my lines. The consultant gave me phones for the contract and I said I first want to go to GSMARENA to look at what phone it was. I was contacted back and I then asked about what tablets was available and again said I want to have a look on GSMARENA. Afterwards I received an SMS stating that my upgrade was successfully processed. My concern is that I never gave my consent to the upgrade. When I phoned in 084 143 and even 140 I was transferred to a few department, but nobody was competent enough to assist me. There was a time when I was holding on for longer then an HOUR, still no satisfaction. I never thought CellC's service is this pathetic. I will never take out a contract with them again. I WANT MY COMPLAINT TO BE SOLVED ASAP!!!