Hi, I know it is tempting to try to beat these scammers, please don't respond to them. By doing so not only do you give them more information, but  by confronting these scammers you alert them to the fact that you are aware of what there doing so they then tweak their spiel and it goes on and on.

What you should do is report these people to Scamwatch http://www.scamwatch.gov.au. this is run by the Australia government

Cheers Wendy