@AdrianSmith
I would say that your contract with AGL has expired.
At this time AGL would reduce you to their current rates.
If you were on Solar Savers they would probably just put you on rate that includes solar usage which may be as low as 5c per kW.
Contact AGL and see what the best rate that they will offer you.
All electricity/gas users should regularly review their rates to see what offers are available.
To assist you in this the Australian Government has a site called https://www.energymadeeasy.gov.au/
Simply click on the link above and you can review GAS/ ELECT rates for your postcode for ALL energy retailers.
Cheers
Neil
Resolve this if it resolves your problem.
If your like the answer click the LIKE button
Cheers Neil
If this comment solves your issue please solve the post, if you like this comment please take the opportunity to click the Like button below.