Discusting Service to the elderly

My mother have an account with MTN for many years. Close to the end of last year she noticed an debit order being debited from her account for R3500+ where her monthly debit order is only R344. I took her to MTN just to discover that TWO *****ulen accounts were opened in her name. Without a copy of her ID or her fingerprints, or proof of ban addount. We were told to get and affidavit from SAP to declare that we didin't apply for these extra two phones. We live in the Western Cape but these accounts were opened in GAUTENG. After many fights the extra two phones were removed but now ther is an outstanding cost of R2800 which MTN keep on deducting form my elderly mothers bank account, causing bank charges for every unpaid debit order. I need to take her to MTN to pay her bill of R344 in cash as MTN can't help her to remove the account details from her account as she doesn't have finger prints. This is discusting service. She struggle to walk but she want this sorted out and I need to take her to the store every mont. To do stuff the honest way is appanrently not one of MTN's values. You need to be ******* to get service. I would like to know HOW these two accounts were added without my mothers's consent and HOW long is it going to take MTN to rectify the accoutn and top debiting her with fees that she is not liable for. Will they even compensate her for all her inconvenience and stressed cause. This is once againg pathetic service from one of the biggest service providers. I am utterly discusted for all the stress an inconvenience caused to my elderly mother.