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No replies but I'll offer this last bit of advice . . .
Back in this thread (buried on last 2 or 3 pages, page 5 it was) . . .
https://neighbourhood.agl.com.au/t5/Energy-Accounts-Plans/Impossibly-high-bill-and-no-options-provid...
Even after all the name calling, Neil did offer for you to send him your smart meter data for analysis . . .
"If you have a ANALOGUE meter you can track your SINGLE RATE TARIFF, smart meter you can PM me and send the data and I will analyse your data for you." - NeilC
You might have to email him your last bill, or a high bill as well.
Heck, even all your high bills (when did that start ?).
I would do that if I were you, your data should show what's going on.
You'll get an unbiased, very accurate picture of any problem.
Contact Neil by private message, click on Neils name on one of his posts, click send private message.
AGL must be making a very huge error in your billing from what you've posted.