Poor Service and Incorrect billing.

I upgraded my contract to Infinity at Cell C. The consultant I spoke to said that he will activate the infinity at the beginning of July and that I will pay the last 2 days of the month June pro rata on my old contract. When the bill came through it was R 2658.80. Clearly a mistake from Cell C and the consultant. After many phone calls myself I went to Cell C store in East Rand mall. After again many calls this time by Patience Ndima to the Cell C head office they told her that it was a consultants mistake as the infinity package of R 1058 was wrongly billed to the month of June. Then after about a week of waiting and normally it takes 24 to 48 hours I got a call. The consultant calling me had no clue and was pathetic. He told me that the billing department will call me handling the case. That was about a month ago. In the mean while I have called numerous of times and each time they tell me they are still working on the case. It is pathetic at the least. The bill was incorrect. I paid the month of June for my old contract for infinity package as well as pro rata. Making the bill R 2658.80. Cell C is saying it is a network for the people. How pathetic is this?