Cell C major disappointment!

Stop all my expired contracts at Cell C. Still they continue taking the money every month via debit order, which I have to then reverse every month at my own cost. I have e-mails containing all relevant communication between Cell C and myself. They have on different occasions ask me to pay "arrears" and then my contracts will be cancelled. I paid the "arrears" believing that it would just finally get the matter settled but then the following month again the debit order goes through. I have spoken to their department on many occasions and was told every time that the contracts will be cancelled. ( This should be on their recordings as they love to remind me every time that the conversations are being recorded)They have blocked all my numbers because according to them I again have "arrears" and now they have handed me over to some or other debt collection agency who are continously phoning me and threatening me. I have heard from many family and friends and even from some of our workers that they are sitting with exactly the same problem with Cell C and have just about given up the fight. However I have come to the point where I can no longer communicate with anybody from Cell C as I find their customer care is definitely a waste of time.