they take your money and dont care

I did a upgrade on my contract , via a call centre , we agreed on a price and some specifics in the upgrade, but when I received my 1st statement ,it was nothing that was agreed upon in the telephonic agreement.my statement amount was inflated and 1 item in the contract was incorrect. I have made many calls to them about the matter ,but to no avail .they refuse to let me talk to a manager, they have a dept. that supposed to deal with such issues ,called the ceo dept. but not even they can help me. I refered the matter to the consumer protector ,then they quickly called me and promised that they will sort it out ,that was 3 weeks ago and im still waiting to have the matter fixed. I then realised that I need to get into the entertainment industry and maybe look like TREVOR NOAH , to get them to help me , but that's not gona happen because I got a ugly mug. cell c is just clueless and I don't think they know what they doing.