Direct debit payments stopped working

I raised this question to support 1 month ago, but I have not yet received a response. I'm hoping that support is more responsive on these forums.

Our direct debit payments (to MYOB) have been declined for the last 4 months, however nothing from our bank side has changed, and none of the account details were changed. I've tried re-entering our account details multiple times and they appear to have been accepted, however after I've waited to see if the direct debit is processed again, it seems to fail again for no reason.

We are now unable to pay our subscription fees with no apparent way forward.