ATO advises I need to "Update an Event" - our MYOB STP is correct but report went twice

Okay I waited for almost 2 hours for the "Help" centre...my call was answered after a long time, I explained the problem and put back on hold after I confirmed I was in Australia and no one came back!!  Due to computer issues when recording my first STP pay last week, the report has gone to ATO twice.  I rang the ATO and they confirmed that it looks like staff have been paid twice the same amount on their end.  Note, my payroll in MYOB is correct in that there is only one payment.  Therefore I can not do a "Pay Correction" next time.  They said I had to contact MYOB to "Update the Event" and I had 14 days to do this.  How do I update an event???  Searched through here and there does not seem to be a definitive answer.  I did see lots of comments of the Help line delays however!