the guy I talked to on this number (08) 9467 9687 hung up on me

Yes, pretending to be from ATO, and they were going to give me a refund of my cumulative TAX from 2014 to 2019. They were asking for my bank details, dodgy

Foreign voice said they where an officer of some type , I said my phone was a business and they disconnected.

Tax Scam

A male with a European accent claimed he was a police officer and said that he was ringing on behalf of the ATO, saying that they have underpaid me in my last tax return. He asked me for my back account number. I hung up straight away.

I rang back the number (08) 9467 9687 once but got disconnected

SCAM!!! Asks you for your credit card details for an "apparent" bonus payment.