Unsolved "cancelled" number being upgraded without our consent, not resolved after refund was done from MTN.

I am really disappointed in MTN, maybe more frustrated. Last year this time an issue on one of our numbers was supposed to be resolved as the number was apparently upgraded - which we did not do from our side. Going to the MTN stores was also not help full and I ended up with hellopeter on which MTN contacted me, investigated and refunded me for the months we tried to stop this number and as we did not request for an upgrade on it. This was done in 2018. Now a year later - 2019 after I cancelled another number and picked up again deductions from my bank account only to find out that the same number ***) which was not upgraded by us as users, kept on deducting money from my bank account for this whole year!! This even happened after the refund as well as the apology and that they will resolve it. NOTHING resolved. I was able to cancel this number only a week back. If this is not *****, I really do not know?? I am a very unhappy. SA is just falling apart with all the *******ion and ***** happening. How can you upgrade a number without consent from me or my husband or a request and then continue to deduct money after I raised the issue and it was supposed to be resolved?? How honest is your people in your company? We tried to get additional assistance but unfortunately the friendly lady on the other side of the phone decided that we can take our issue somewhere else and that she will only cancel the number now. So what will happen by month end?? Will I be paying MORE for someone else who has been using my number for the past two years or was this a bonus for a boss??

I am really sorry if this is a harsh message, but I just had enough of trying to get things sorted our and no one is willing to assist.