I'm in the same situation.
AGL signed me up for connections to an address I've never ever lived in. I've been ignored when I've contacted them, before I was able to force them to speak to me over the phone. When they eventually spoke to me about the situation they tried to scam me further by telling me there would be disconnection fees and that they would be unable to disconnect it for 1 week.
I have never lived at that address and can prove it, but unfortunately this organisation appears to be built on fraud and will attempt to scam any unsuspecting individual.
It sickens me to see that I'm not the only one who this has happened to. I feel for you, rufusfrasergord. I hope you got it sorted in the end.