Unfair billing from Cell C, as well as retaining of recorded sales agreement.

I took out a mobile router contract over the phone. I asked specifically if it is a fixed amount for 24 months and the sales person rep**** YES that is correct. I did mention that I have heard of people experiencing problems with sudden surprizes. Cell C also HAD to do a credit check to see whether I could afford the amount. The call had to be interupted and later the sales person phoned me back to PICK UP from where we ended previously. Cell C broke the agreement that we had diring the first half of the sale. Around month 3 I got billed 4x as much as the supposed FIXED fee. I tried to phone, sms, email etc and got nowhere. I visited my nearest store in Kokstad, where Kyle Veraza was also uncapable of giving me the proper complaints email as well as Cell C head offices contact details. I am really upset that Cell C retained the first half of the agreement and claim that there are no available recordings, then suddenly only have the second half of the sale AGREEMENT, where I specifically refer that we are carrying on from where we ended previously. I am being bul**** to pay rediculous amounts and my credit profile IS affected. This is unacceptable bullying and a huge waste of time and money to try and sort this issue out. How can you by law do a credit check and charge more than what was considered affordable and change the agreement? Please sort this **** out now and stick to your advertised values.