The struggle with MTN

MTN has 5 accounts for my elderly mother on their record. The Tygervalley store said it is **********. They deduct almost R900 every month. After my previous review, I contacted them and no luck, they don't come back to me with answers. I receive reference numbers every time I go to the store, but nobody seems to know anything about it when I go back. What is the use of a reference number... MTN never closed the accounts and still deducts money for no service rendered. How do they get away with this?? It's a time when everyone is suffering, especially the older people, what joy do they get from taking from the needy. It's appalling to say the least!!