Old Mutual stole her salary

My mother started getting her salary through Old Mutual bank from January this year and all was fine. Until she didn’t receive her salary on March 31st, just in time for Easter where money is much needed. When approached they first said they’d investigate the matter within 3 working days. In the meantime, her debit orders are going through. They then said they’d investigate received the money and then “saw something wrong” and had to return it, and that the matter is no longer their problem, she should contact her payroll. This is utterly unacceptable and no one should trust these people with their money. We’re sitting through the long weekend uncertain if she will get her money back as she was extremely inconvenienced.