If things get desperate and you are good with people ... you could try talking to your bank.
Disclaimer ... the Bank has absolutely no responsibility to help you in this situation ... as once you press the button to release funds your on your own. However, and again, if you are good with people and follow what I say ... you have a 50:50 chance of getting your money back
NOTE: this will only work if you go to your branch (the branch that owns your account ie, the BSB branch)
i) get all the transaction details off your online statement ... if your lucky or anal you've written down the transaction code and all that online transfer detail.
ii) print everything off ... so you can show the customer service person hardcopy to save them looking for it.
iii) go in to your branch just after 10am (just after the openning rush and way before lunch)
- if there are lots of pensioners in the branch or coming out the doors ... then turn around and come back tomorrow (ie, its pension day ... don't even think about getting friendly service
)
iv) Don't expect to get what you want or need ... come in as if this is your last chance ... be honest and self deprecating eg "I knew I should have checked the guy out in more detail before I transferred the money ... but I didn't realise he was a young punk [assumed by me as I'm age-ist] ... and I was tooooo trusting ... bah I'm an idiot sometimes ..." self deprecation with a bit of humour works miracles.
Lastly ... it has to be your branch as they own your account ... and other branches will likely just contact your branch (maybe not) ... being in a suit and having a good relationship with your bank (ie, home loan, plus credit card, plus a bit of cash) also helps.
Thi is unfortunately Not guaranteed ... and is alot of work if you suck with people, but has worked for me.
Good luck with it and hopefully he has a logical excuse and it all works out for ya ... I suggest you PM your favourite Mod ... as a PM from a Mod seems to work wonders ... and if it doesn't a permanent IP ban is needed as I don't want to be trading with rip-off scum on here.