Cell C ****med me for 5 months and still continue to!!

I renewed my contract with CellC for a R179 per month contract. From the start they have been ******** me out of my money. First R448, then R249, then R448, Then R607 and now R786. They are the biggest service provider ******** i have ever seen. Now it's a even more difficult problem to cancel my contract. They keep apologizing for this and yet they are useless to fix anything.