obvious scam voice generated message left, that states if I don't return call they shall issue an arrest warrant in my name.

Caller: Automated

Threatening for prosecution if not paying the tax. I have not done anything yet that would incur me any tax.
It is a fake/scam. Ignore it.

Caller: Scammers

Left an automated voicemail saying there was a lawsuit filed against me and to urgently call back.

Caller: Scammer

ATO robocall scam

Caller: Fake ATO

This is an automated message that threatens you saying the ATO has a lawsuit against you. The number says to call them back and if you don’t, you’ll get arrested by the police. Do not call the number back. It’s a scam.