Hi Jason
Shellharbour City Council used to experience this all the time, until we decided to include the address of the property in the subject of our emailed 603 certificates to infotrack. Now when they call, we locate the email with the 603 certificate and confirm it was emailed and suggest they check the particular date in their emails. We found by doing this, and not reissuing at their demand, that the staff at infotrack have stopped calling us.
Good Luck
Carla