Not just Sydney area.
I'm in Adelaide and just got a call from them

Caller: ATO Scam

Calling those in the ACT as well.

Caller: ATO Office

They warned me about Tax Payment and suggested me to reach out to ATO officer to avoid Penalty and subsequent arrest.
Then to connect to ATO it says Press 1 to talk to ATO Officer. After that a silence for 5 secs, then a beep and call disconnects

Caller: fake scam ato debt collection

i asked if i'm luckly enough to get to pay my debt with itunes gift cards, when he said yes i called him a scamming c*nt and he hung up. reported to scam watch and blocked their number.

once again another scam saying they are the ato. When is the government going to do something about these calls to protect some unsuspecting people who get these calls.

Caller: Fake ATO Scam

Scam ATO voice message threatening final notification before arrest on tax fraud.

I called back number (02) 6216 1144 rang once then gets disconnected automatically.