Missed calls from (03) 7031 9712 and (03) 7031 9713. Neither directly left a message but (03) 7031 9713 did seem to forget to hang up which gave me about a 20 second voicemail listening to the background noise of a call centre. Couldn't tell where but they were speaking accented English which makes me think probably based overseas and very likely a scam. Blocked both numbers and will continue to block any others in this sequence as they arrive.

I did not answer but the caller (accidentally?) left a 3 or 4 second message which sounded a bit like a call centre. I've blocked the number.

Caller: Free energy saving devices scam calls

This number (03) 7031 9711) and (03) 7031 9712 have tried to call me a few times, and never left a message, except for once, which was silent except for background noise, which sounded like a call centre with multiple people. Thankfully I now have an app which blocks them, and for most that aren't blocked, I prefer to check each number manually, so I don't get false negatives, and miss calls that are genuine. Now that I know, their numbers have been blocked.
They are most likely the idiots trying to offload their supposedly free energy saving devices. I have been getting so many calls from these scammers, that I have a new tactic, which I hope will work. I'll answer the call, and when they make the appointment, I'll agree to it, but sound like I'm not sure what, or who they are, then when they come to install their wares, I answer the door, and tell them that we have no idea what they are here for, and that I'm not interested. Hopefully with enough visits, they will get the message.

Missed calls from (03) 7031 9711, (03) 7031 9712 and (03) 7031 9719. No message left by any of the callers. I called each of these numbers back and was connected to the same recorded message each time, the message indicating that all staff were on calls at the time and that I could either hold the line or hang up, in which case an 'executive caller' would call me back later. The line disconnected as soon as the message finished! This is quite possibly a scammer group activity.

can add (03) 7031 9711 to the scam list