They called me about a week ago and again today. Did not leave a message either time.

Caller: Unknown

Same as the others - two calls, no message left. Not game to ring back. Seems to happen (other numbers) after I’ve signed online petitions.

my mobile flagged it as suspect spam. no message left

They called and left no message.

Same as above. Called me in the evening. Didn't leave a message

I’ve received calls from this number several times. They don’t leave a message.

Call and don’t leave messages

Rang twice. Definately unknown caller
Scammers.

Didn’t leave message tho rang twice

Scammers

I called back the number (02) 9052 8771, rang and got disconnected automatically