Cell C what *******

I am so tired of receiving a different amount every month on my contract. I can not wait to leave to useless network. Counting down the seconds. I have made several calls to Cell C to inform them that I am being billed extra per month. And every month the consultant informs me that they will amend it. Trust me with all the signal problems (slap tiger) and incorrect billing, July couldnt come at a better moment. I cant wait to move to a network who actually listens to their customers. Cell C you are useless. No one is able to rectifty this or tell me why my cellphone bill can go up to R1000 in one month. Not a happy customer at all. Cant wait to move to the best network. VODACOM