Cell C *********** Staff and Not Trust Worthy

I have for the past 5 months been having issues with Cell C regarding 2 Contracts which I took out with them in October 2020. Cell C have changed my debit instructions, on these supposedly sealed contracts, to accounts which I don't even have, and then again changed to a Cash Deal, then when I stated this to the person calling to say my accounts would be handed over I was told they would get back to me. I was harassed by their call center every single day at 8:30 and as soon as I asked for a copy of these contracts, the call was either abruptly ended or I was promised a call back., which never happened, till the next morning and I got harassed with the same story again. I have 4 contracts with them and they are all on the same debit instructions. Eventually a lady phoned me and said she wanted to sort this matter out and we eventually came to an understanding that the accounts would be debited from the beginning of April and the matter was now closed. Only 1 account is now being debited and I am now being harassed by some collection agency who claim I owe Cell C R62 000.00. No-one at either Cell C or this VVM can supply me with any information to this amount and I have now HAD ENOUGH!! If this matter is not sorted out with n the next 7 days I will be taking legal action against Cell C for Breach of Contract, because no-one has the right to alter any information on a contract that I have signed!