Poor customer service - Contract

Worst customer service ever, in store and over the phone its the same no difference at all. It's disgusting and very dissapointing that I have been going back and forth as from November, making numerous calls and visiting the store with no help at all. All I want is to pay what is difficult there. June 2021 I moved all my debit orders to Standard bank from Capitec, for what good reasons I don't know but apparently Cell c never moved, because I was not using their simcard at that time it actually took me a while to see the sim was block or discontinued. In November I then put the Sim and saw its no longer working, called Cell C to ask the problem and they told me the sim has been permanently blocked because they were not getting any payment, that was strange but the main issue was to resolve it. They told me the account is with debtor collectors and they cannot see any other information, different agents would give me different numbers that are not even working, lots of agents dropping my calls, when I want to speak to manager they tell me stories. I went to the store 3 times all they could tell me I must contact customer service, the same customer service that has been very useless. I went far as emailing them all they could say is they will contact me, no call till now. I now don't know what to do, this is affecting my credit record, it's been months now when will I ever get assistance? How can you put someone on debt collectors and don't know which one? How did it lead to debt collectors without warning me? Not even a single day debt collectors contact me, when will they ever do? This is not okay at all, you making people's lives difficult and miserable