First National Bank Business Banking is useless

I sincerely regret having chosen FNB for my business banking. They are utterly useless. I have been trying to set up a subscription debit order for an accounting package to come off my business account for the last 3 years but keep getting the same error: 'Something is not working. Give us a few minutes and try again. If it still doesn't work please contact us'. When I eventually get hold of someone on the help line they are unable to help. They pass me from one consultant to another where I have to repeat myself and the various steps over and over. This is at my own expense. The consultants tell me they are not able to call me back. Not one consultant is able to tell me what the problem is or even attempt to resolve it. I cannot rate this bank poorly enough.