Caller (male, unidentifiable accent) stated he was from NAB fraud squad. I don't have a NAB account. Make of that what you will but he hung up when I told him that.

The man said he was from NAB fraud unit and was calling about a $2k odd transaction from my account to Mr Smith in USA. My spidey senses were immediately triggered by the reference to NAB but he had my number, full name and the right email address so I listened. He asked if I had authorised such a transaction and could I check. I told him that it would be impossible for me to check a NAB account I didn't have. He asked if I was certain, which I assured him I was, and he sounded disappointed but I ended the call at that point.