MTN sort out this mess, its been too long

On the 24 of Dec 2018 I got an sms from MTN saying a have a new number waiting to be approved, to my surprise I never took a new number with MTN I called their help desk to my surprise the lady who helped me said she can't trace any outstanding new number under my contract I should wait for month end of January to see if they have deducted any money unknown to me that's when I can lodge a complain, to my surprise I've already gotten an sms here saying a new number is waiting approval, indeed on the 30 January 2019 a new number was added under my contract and I was debited for it, on the 01 February 2019 I lodged a complain as per USD number 1- ********** 4666 at MTN Irene mall, since then to this moment MTN has been debiting my account for a ********** number I know nothing of, whenever I got to enquire at MTN Irene mall all I get is my complain has been escalated yet they keep debiting Monet from my account, fast forward to 02 May 2019 my problem has not been solved and to add a salt to a wound MTN has now slapped me with a bill of +-R25 000, when I ask what is this exorbitant amount for I was told that I asked for contract termination, now I'm sitting here puzzled as to how on earth can I terminate a contract that has an outstanding ********** activities, now im standing here with minus R21 755,39 on my Absa account, with that kind of money on a minus affecting my credit score and tarnishing my image who will be held liable for this mess