Handed over for Cell C's fault

I called on 2025/07/03 to cancel the contract for a number I was no longer using for close to 2 years. I was told the last debit would go off end of July and the cancellation would be effective 01/08/2025. A debit order went off at the end of August. Another amount went off in Sept and that is when I reversed the Aug & Sept payments. Another debit order went off in Oct and I reversed it. This is around the time I called you to enquire why I'm still being debited for a contract that was supposed to be cancelled. No one is acknowledging the fact that I should not have been debited for August because now I was handed over for something that is not my fault!!! I am now handed over and NuDebt claims I was handed over for R855. Why the heck should I pay for someone's negligence and CellC is not accepting any fault in this whole process. I was charged by my bank for insufficient funds this morning because I was not even aware why I'm being debitted. I will not stop complaining until someone write's off this whole amount and sends me a formal apology. I want whoever will be contacting me to look at this case thoroughly before they call and tell me about the August debit order which is the only thing according to CellC why I'm at fault