FNB- How can we NOT help you

I used the Scan to pay function which resulted in a double debit on my account. I have now phoned five times to get my money returned to me, being put through from one person to the next, but never a manager that can help me. Finally someone with brains figured out that they can’t help me and put me through to someone in a different department who then told me it has to be escalated and that is t will take 24 to 48 hours. This is unacceptable as the funds are needed and quite frankly it is not FNBs money so why is the system not working. I don’t get interest on the money they took, and I am the one that has to wait.