Horrible service

I am so annoyed with the bad service of CellC. I'm january the debit order did no go off. Ever since I'm paying a additional R200 to cover for that instalmant. In July CellC started to call me asking me for my proof of payments as I started to make the payment cash. I sent it like nine time and they keep on telling me to re-sent it. Every week thy cut my phone and then I have to call out all my airtime just to hear I have to re-sent the proof of payments. Spoke to a lady she mentioned to me the January installment was not paid. Told her I know but that's why I an paying the additional R200. She said to me I can pay off the arrears I need to pay it as a once off. What about the additional payments I made every month? Why should I pay for something that I can't use as every week they cut my phone till I call and hear the same thing?I really don't appreciate the service they provide and there is no one calling me to finalize the matter it's just the same cat and mouse game every month. I really need someone to get back to me or they can just as well cansel my contract.