*****ulant upgrade for which i am being billed for

My phone contract was due for an upgrade in Nov2015, I did not want to upgrade my contract so I contacted cell c call centre and instructed them to end my contract as I wanted to move to the prepaid system. <br> I was then informed by Cell c that my contract had already been upgraded and that a new handset was collected and signed for... upon further investigation by myself and cell c, it was found that the contract was **********ly upgraded. - this whole process took roughly 2.5 months just to figure out that it was a ********** upgrade. during the interim I was being billed for a phone that I did not collect or request. earlier this month a cell c agent contacted me and said that I would be refunded all the money that was due to me as my contract was set to expire in November. to date no such refund has taken place and on today cell C debited a further R843.00 from my account without reason. previous to this my account with cell c was up to date and paid timeously. i have tried to contact cell c numerous times to resolve this issue however i have had no joy whatsoever - they just transfer me from 1 department to the next and i have to hold on the phone for ages. please help me..