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Does the bill say Estimated Read, or Actual Read ?
If estimated, AGL often charge a lot more for some reason, and that is easily sorted out with a meter read submit, or with AGL on the phone or chat.
Estimated reads are mostly on older analogue meters, where there is an access issue on read day, locked gate, or dog present etc.
Digital meters rarely have this issue and are read via online connection.
Do you know if you have a digital or analogue meter ?
If you are having reads done, then you have an analogue meter.
If it is an older analogue meter, you can submit a read via your usage page on the AGL app (or web account).
Analogue meter reads are usually accurate, but if you did get an actual read, check your meter to see if it is a little over what the bill says, and if not (a lot less than the bill read), again it can be adjusted fairly simply.
If the meter is a little over now what the bill says, then the read was likely correct, and (unless a meter is rarely faulty) the charges are probably right.
Compare your last bill plan / tariffs and compare if so, you might have slipped off a lower price plan period, or prices might have jumped significantly.
