***** invoices sent by MTN

I have previously complained about MTN, who are sending SMS of ***** invoices, to its costumers, and then taking money out of their accounts, at the end of the month. (FB is full of complaints) My husband has just received a 2nd **** invoice. (amounting to R8757.84) It seems MTN, do not know or care sadly, how to stop this type of *****, so I would not recommend taking out a contract with them. My husband is a pensioner and cannot afford this sort of ***** action on his account. He is now trying to terminate his contract.