Unprofessional Company

My mum was handed to vericred as she is a pensioner who's medical aid didn't settle one of her procedures. Due to amount outstanding we made arrangements to make payment. Through making payment, not once you would receive a statement showing what is your balance. We would then miss a month's payment just to get the attention of vericred to call and then I would request a statement so you pay and pay and there's no evidence if they received your money and what is the balance. Eventually I asked for a statement and settled the amount outstanding on the statement as that what was due. 2 months later I get a call to say my mum still owes them money. Now they threaten to list her with ITC Trans union. She is 69 years old and now has to put up with threats and dealing with unprofessional company whom if they did their job properly and allocating funds correctly would of had the account settled. Far as I am concerned they should settle the account with Netcare due to someone not doing their job properly. Does it take two months to allocate money paid to them.