Account closure and complete incompetence, yet again!

Has anyone else noticed strange behaviour at FNB? I’ve had various business and personal accounts with them since the 1980s and, until fairly recently, they’ve been no worse than any other bank. I have a current account which is used only to process a monthly dividend payment. Last month, the investment company advised that FNB is no longer accepting the payments because the account is closed. When I asked FNB about this, they confirmed the account has been closed ‘due to inactivity’. All my subsequent attempts to extract an explanation from them have been ignored. Even my independent investment consultant and my attorney have been rebuffed. The most obvious explanation is the usual administrative incompetence we expect from corporates these days, but my fear is that the account may have been hijacked.

Can anyone offer advice? My situation is complicated by being based overseas for most of the year, so I can’t pop into my local branch and speak to a real person.