Didn’t leave a message but could be a company auditing solar systems for Victorian government. Expecting a call to arrange but surely they would leave a message. I never pick up on unknown numbers without first checking if a scam, blocking if required.

I called back number (03) 9112 5812 reached voice mail for Ausgreen Homes.

Caller: Oz Green Homes

Guy called from Oz Green Homes? totally random call, never dealt with them before and totally unsolicited. checked the number online and the company does exist and is in Victoria so could be legit.... if not annoying.