Search for answers relating to your AGL account or your AGL online services.
If they are unable to gain access to your meters these will be estimated unless they are remotely read.
If you look on the back of the bill, this will advise if the account is based on actual read or an estimate.
Depending on your meter type you can provide your own read via the AGL App.
If you are not able to provide your own read, the account will be updated when the next actual read occurs.