To ensure that your concessions are being correctly applied to your bill, you can use My Account or the AGL App:
My Account
log in to your My Account and select Profile from the menu in the top right hand corner.Scroll down to the Concessions section and click edit.The screen will show any active concessions, or "no active concession card" if none are active.
AGL App
Open the AGL App and select Account from the bottom right, then Settings from the menu optionsSelect ConcessionsAny active conc ...