Caller: They said they were from National Australia Bank Security department

Tried to tell me that a $600+ transaction was just intercepted on my account. When I said he sounded like he was in a call centre and not a bank he reiterated that he was from the security department of NAB. I then told him that I had received a phone call 20mins prior from his office telling me that a transaction was being made to a Mr John Smith in America. Strange - he disconnected the call.

I did have a call saying that 20 mins prior but it was from an unlisted number.