the voicemail message told me to call back or I would be arrested. voicemail had an American accent.

Scam call claiming to have a legal case and tries to scare you with an arrest warrant

Recorded message, American accent claiming tax fraud and arrest warrants, funny if nothing else

An American accented robotic voice claimed that I was being prosecuted and unless I called back (on a US number), they would send the police!

Left a computer voice message (like the voice of Stephen Hawking) that said I needed to call the number back immediately as there was a warrant out for my arrest.

Caller: Somebody claiming to be from the ATO

Informing me that the ATO is about to start legal proceedings against me and that a warrant for my arrest will be issued shortly if I don't call back.

I rang once and got disconnected

" An arrest warrant will be issued to your name " it was a weird robot voice, super creepy