This is very odd and I suspect that you don't have the whole story, since this is about your friends. There was a similar post a while back, where the bank had written several times about the account and nobody responded.
Your friends need an appointment with the bank business manager (not a counter clerk) straight away, to find out what has happened. If salaries are going in, the accounts must still be live. That's the only advice I could give - only the Bank Manager will know what's been going on.
You say it's a business account but if both are employed and not running a company of their own, perhaps that's why - they should have a personal account not a business account. Only the bank can say.
I don't understand the comment about money having to go to the Treasurer - the treasurer of what?