Cell C still fails to resolve matter on account ***1

I am nowhere near having my problem resolved. I have sent cell c all the proof, documentation and communication relating to my problem. They instructed Nu Debt to deduct R815.84 from my bank account. NuDebt did this in May without my authorization. Then Cell C went and added a debit memo to my account end September for the exact same amount and again this was deducted from my account. I am so angry and frustrated. They got one of their agents to phone me and tell me that they're dealing with the problem, then that very same agent comes back to me and tells me that they are in the right and that they'll have to discuss it with NuDebt. The instruction to take money from my account came from cell c as they handed my account to NuDebt, and the problem is still unresolved. I have checked all my facts. I am in the right, and cell c has ****** from me and behaved *********ly. I have been a cell c client for more than 10 years, and I have been left with such a sour experience that I will not be renewing my contract when it comes up for renewal, because they have not fixed this problem.