Cell C - USELESS!

On 9 November 2018 I reported ********** activity on my account to cell c. I immediately called Cell C and was informed that my online details was compromised and the ********** gained access to my account. They unblocked my set limit and increased the spent amount and data was purchased on my account. They requested me to report it to their ***** department and in the interim the ***** department requested an affidavit and copy of my ID. In December my wife called in to obtain our debit order amounts for our next bill and was told that it is the normal charge. In January 2019 I received an account statement which now reflected the ***** amount R4 644.44 some odd amount plus my normal charges as due and payable with immediate effect. In other words Cell C's ***** department did NOTHING to sort out my query. After many calls with reference numbers I got told that they have a note on the system that reads the matter was resolved and the client agreed to pay the R4 644.44 which was news to me since I have never received a call from anybody. Up to date my querry is still pending. I instructed my bank not to allow Cell C to debit any other amounts accept the normal charges. They are now threatening me with legal action and disconnection of my number and and and..... I am at a loss as to what to do. Please HELP!!!!!!