VERY UNHAPPY CUSTOMER!!!

I have a really big problem with cell c, these people are treating me so unfairly, I have had a contract with cell c for so many years but now i see after this one ends it will be thee end with them, My credit record is being affected by their unfairness, On my credit record it shows that as if I have 3 contracts with cell c & this is not the case, I have 1 contract and not in arrears, I sent them a screen shot of my credit profile so that they can rectify the issue but now they are saying I actually owe them, ,and i know for a fact that I don't owe cell c, I specifically remember being overbilled & when I Called I was told that I'm paying for pro rata & migration, and today it's the same explanation I'm getting, so why do I need to pay for that twice, so clearly when ,they bill a person they don't make sure things like this do not happen, now the agent I was talking to tells me it's not going to be removed from my credit profile cause I owe them. You know what I even regret referring people to cell c when they treat their customers this way, last year a friend that I convinced to take a contract with cell c was complaining about being overbilled but I told her it was probably for pro rata or something cause I was also billed for it but today here I am & that amount has been there for over a year I just thought they'll update it on their system but now that I see it's not going anywhere and actually complain about it they say I owe them, If I owed surely someone would have called and let me know that my account is in arrears, after a year a customer is complaining only then you let them know that they owing you. First it was Cell C Get More now this.

THIS IT FOR ME, THIS IS MY LAST CONTRACT WITH CELL C!!!! .