Poor business support

My online banking suddenly stopped due to a system error. I raised it with FNB Enterprise and they said they will sort the issue out. Three days later they send me an email to say it has been resolved, but when I checked it wasn't. A week later the issue is still not resolved. I cannot do online banking nor use the app (both tells me there is a system error and apologize for the inconvenience caused). This all happening at the worst time, month end! My business banker is nowhere to be found. Not responding to my messages, phone calls or emails. Whenever I call they tell me that the case has been escalated. I don't need escalations, I need solutions!