FNB online banking is floored and unreliable

A staff member closed his FNB bank account on the 13th of October. When our company paid his salary into this very same account on the 27th of October, the funds didn't bounce back. FNB have even given him a confirmation letter that the account is closed but the company bank account shows the funds cleared into this account. If it was a different bank that we were paying into and the account was closed, the funds would have rejected immediately. Now FNB say they cannot give me any assistance. I need to wait 48 hours to see if the funds will return and then if they don't, I need to fill out a returns form which will take 10 workings days to be sorted out. Your online banking is terrible and not reliable.