These are Indian Scammers, they even employee ladies, a young lady introduced herself as Karen Smith and started asking for details. When I asked her to pull up the details as she's from ATO, she hung up. The funny thing is that when this person initially called me, I was on another call, so I called up and the phone was answered as "Australian Taxation Office". There were other people in background making similar calls. Looks like this is a big setup!