Called 7.00pm, Asked for me by name.
Advised the person asked for wasn't home, said they were from AGL and to ring AGL tomorrow regarding account.
Obvious tele marketing call.

I answered this number on my work phone and it was a 'John' who said he is a geologist interested in the hiring & training process for our staff. I'm assuming he wants to provide training.

you answer this call and no one answers, its obviously a machine collecting the time you answer so they know when best to call you

when you answer no one talks back, I guess its a telemarketing calling machine to log the times you answer so they know when is best to ring you to get you at home....