Theifs!

I went into MTN table bay mall on the 25th September and asked about a upgrade. The lady Erin, said to me that it's too early for an upgrade so what she can do is give me the phone and the upgraded price will start from 1 Feb for 1199 and until then I will continue to pay 925. I asked over and over again that I definitely will not pay anything extra and the fees will only start for the new contract on the 1 Feb. She assured me it would. The first bill I get I am getting charged double for both contract prices. When I call ktn they say it's a pro rata fee no matter how many times I explain to them that is not the case as the upgrade is only from 1 Feb. They also assured me that from my next payment it'll be the normal 1199 amount for the new contract. I get my new statement for the next month and somehow now the amount is even more. So now I am paying over R2000 a month. When I call Erin she says she is Logging a request and then I have to keep getting back to her to find out progress. Each time she says MTN are investigating it. I don't understand what are you investigating? The amount you are charging me is inaccurate. You need to refund me and correct the contract price. So what is taking weeks on end to fix this?? It's absolutely ridiculous and needs to be resolved immediately! Please can MTN get back to me regarding this and resolve it immediately. Trying to call the call centre is impossible as they never answer the phone and if they do after the 100th time calling the just cut the call. Absolutely terrible service!