Claims to be from Victorian Government and will offer to upgrade your home exhaust system, they'll add a shroud onto your existing bathroom exhaust fan supposed to keep cold air out and warm air in and all that jazz. It's free so whether or not it suits you is up to you.

They also call on (03) 7031 6538.

Silence and then caller hung up

Called twice in a row but didn’t leave a message.

Caller: Looks like spam

Continues to call repeatedly and sounds like spam, doesn't leave message, I have blocked it

Rang twice. Left no message. The front end looks familiar to other nuisance calls.