Caller left no message and if you call back there is a voice recording stating the number has restrictions on incoming calls. Sounds dodgy.

Caller: Electricity savings.

Spear fishing / information theft information gathering mob. Avoid.

First they asked me who my current provider was, the proported to be from them, but didn't have any of my details on their system. Played them along for a bit, won't go into detail as it would give them quality control feedback.

called and hanged up immediately

Caller wanted lots of personal information to save 43% on energy bills. They said this is their website: https://switchandsave.com.au/

When challenged, the nice Indian-sounding lady insisted "this is not a scam".

Said that they could help me with my bills. Got a bit pushy when I said I wasn’t interested.

Poor English stating they where from some government group. I stated do not call me again and remove me from any marketing lists or further contact. Female caller then asked if they could call me back.
SCAM DO NOT CALL THEM OR PROVIDE ANY PERSONAL INFORMATION

I answered, there was no one on the other side, the call hung up after 12 seconds

Called them back right after I let it ring out.
Says that the number has incoming call restrictions.

Of course it does. : (

Caller: "Family Savings"

Scam, pretended to be financial institution

Accepted the call, but none answered when I spoke to them. Not sure. But blocked now.

Caller identified themselves as 'Australian Lifestyle Surveys'.