BAD CUSTOMER SERVICE AND SELLING WRONG CONTRACT DATA

I was called by the Cell C consultant to sell me a contract phone and she explained everything, I ended up taking the phone but now here is the problem she called me again when received a phone to tell that I have to call this number 084135 to ask the customer service to R0. 00 bill my data Sim card so that I don't get a crazy bill in future but to my surprise that was not done because I was promised to pay R289. 00 every month but now I have to pay R467. 00 which I fail to understand. When I called the customer support on Friday the 10th of June 2022 at 17:09 his name was Wonder or Wandile not sure of the correct name, he promised me that they will check the recording of the 05th of April of what was transpired on that day and the discussion we had and he will come back to me with an update after 48 hours which was supposed to be on Wednesday today its Friday no respond received