Myob Exo - Duplicate Creditor Batch - Major BUG

A duplicate creditor payment batch was accidently processed by one of our staff and instead of the creditor invoices now showing as overpaid, EXO has just applied the duplicate payment to the invoice/s (increasing the invoice amount).

How do we reverse the direct credit batch?   We only have an option to reverse a cheque payment (who does cheques anymore, seriously???) but not a direct credit payment.   (The ABA file wasn't uploaded to the bank so the creditors have not actually been double paid).  

We tried to manually reverse one of the payments but because EXO increased the invoice total, the invoice now shows as outstanding.  For example:  a $50 invoice had 2 x $50 payments allocated, but when both payments were reversed the invoice total shows as $100??.   The correct payment was applied to the invoice, but it still shows as overdue by $50 .  The Aged balance shows correctly as $0 but when I run an outstanding invoice report the invoice is showing up as unallocated. 

How on earth is one meant to fix this ??    This has to be one of the worst accounting programs out there!!