Screw them. Call the Ombudsman now.
At the apartment block where I previously lived, the electricity provider was my own choice, but the Hot Water was shared by multiple apartments and its electricity provider was chosen bythe Body Corporate. They would divide the bill up as metered and I would pay my share.
When I left the place I carefully switched off all electricity and gas providers, and swapped over to my new place, relatively seamlessly. Except I didn’t swap over the Hot Water provider. I assumed the Body Corporate would handle that, as it wasn’t me that set it up, it shouldn’t be me that shuts it down, it would just seamless swap to the new tenant.
But I started getting bills at my new address for the hot water the new tenant at my old place was using.
What a rigmarole to get that straightened out. It took several months, a lot of back and forth, with tenant, Body Corporate, and Hot Water provider, but eventually not only was it sorted out, they gave me a refund cheque for something I wasn’t owed.
Who’ll call AGL who’ll say “we’re trying to help but this crazywoman won’t give us her name or phone number” 
Somehow this line alarms me.
Yeah they do, just search for AGL Energy. There’s even a group for AGL Bad Experiences!
I hear ya. It’s such a pain sorting these sorts of things out 
Foxtel wouldn’t give us an account because the previous occupants hadn’t paid their bill. Took us a ridiculous amount of stuffing around to get foxtel - and we moved in the middle of the race season, so were desperate to get it switched on asap! I presume they thought we might be the same people, trying to get foxtel reconnected without paying the old bill, by using a different name or something… but still, they were acting like if we wanted to get foxel, we’d have to pay the other people’s bill (never actually stated, just heavily implied). Was very frustrating considering we’d had foxtel at the old place, and could give them all those details to show our history, so it was pretty obvious we were who we said we were.
grrrrrrr
Hope you get it sorted
Kambuckta, I was going to suggest the Ombudsman as your second phone call. I had some problems with Origin when my father was hospitalised and their was a lot of rooting around.
In the end I rang them, and to their credit origion was very good about quickly fixing it. I imagine AGL would be the same.
(I must admit when some guy in the Origin office in Melbourne rang me at 8.30 am his time- which was 5.30 am my time- I had the upper hand when I mentioned it 
)
I know! I was actually kind of impressed by the sheer brass neck of it; the letter strongly implied that there was no Option C. I almost wanted to ring them up and ask, ‘Does that seriously work on anyone?’