Over Debited and no feedback

I upgraded my contract with Felisha Chetty, she called me and I explained to her that I need more data and call time, I asked her specifically if the data will be split and she said no, I was promised 8 gigs anytime data, amount of R1600 including the phone and call time. To my surprise the data was split leading to me still having to buy data over and over. I queried this matter and said that this is not what I was promised. She told me that she can change my package for a little more and I said no this is not what we agreed on and that I am not willing to pay any more than what we agreed on. She has been promising to sort my stuff out, and migrating me back and forth. I now have been charged R3000 when I AM SUPPOSED TO PAY R1600 per month. I have been calling cell c everyday to follow up, the call center tells me that I just have to wait mind you I was promised two working days its been almost a week and I am still waiting. I contacted Felisha Chetty she told me they are going to sort my matter out and that a lot of people where charged incorrectly this month. She even said taht I was not supposed to be charged and admitted that it was a mistake. I am so disappointed that I keep calling and I am even asking for an email they just tell me I just have to wait. This is my money I need my money back. I did not agree for any additional charges on my contract account. I also was not informed about this. I keep asking and asking what is going on with no successful feedback. The call center doesn't even want to assist with an email so that I can follow up myself.