MTN account non closure

Once they get hold of you and your bank details, you will never be free from them 😩 I am feeling pretty frustrated... I left SA end of 2018 and sunsequently paid up my mtn contract... In 2020 i was not able to use the sim anymore so sent numerous requests to cancel... But the monthly debit continued and i incurred bank charges due to no further funds being available... Then it seemed my account had been closed... But no, 6 months later my daughter who still lives in SA and who used my details to get her first phone many many years ago and who now has her own personal contract, started getting messages about an outstanding amount and had her services frozen (!!!!!) On a visit to SA last year I spent a good few hours at mtn in cape town, howard place, trying to explain this... Once again, i thought it was resolved... But no... My daughter once again has had her services curtailed (how???? She has her own contract and not under my name!!) and she has received a bunch of requests for money and threats about a bad credit rating ... Is this a ****? Is there some higher authority i can go to? If i give up and arrange for someone to pay them off, will it end there???? I am sure my old number has already been reassigned... Perhaps i will be paying the new owners contract... I have sent messages to the debt collection agency's whatsapp .... No reply...