This is a company called Intelli hub. Intelli hub is contracted by Origin energy to install electricity meters to peoples properties. Whether they be upgrades, solar or new connections, they call to check to make sure your meter board is ready for the installation.

pretty sure this is the national response centre for APA group. they contract to origin energy.

I called back number (03) 9411 2100 rang once then goes to busy tone.

Caller: APA

This is the national dispatch line for APA they contract out for Origin for gas

Origin Energy contractor.
Scam to get you to install digital meter.
Meter ready gets paid by Origin to falsely report your meter as faulty
so they can install a digital meter.

To do with metering electricity. In this case origin. Don't keep appointments.

Caller: Origin Energy

They left a message with a callback 1800 number and reference number for my solar connection

has called me numerous times. no message and cannot return call as line is always busy. blocked

didn't answer call, called back, busy signal

No message. Rang twice.

Origin Energy

Received a call from this number. Answered and they hung up.