Chamane,
Assuming this is a total scam: If I were in your position, I'd contact Canadian counsel (it wouldn't be hard to find), find who this DavidG character is (we can get IPs in addition to whatever info you can find), and see if they can get you the full amount you're owed either in cash or by garnishing his wages. I wouldn't take the nonsense offer he's put out there to cover his own butt in that other thread (it's crap and still reaps him a significant amount of ill-gotten money), I'd be out punish him using legal methods (then agan, I am an American attorney... and I apparently like parentheses). Yes, it would require legal fees, but the total sum owed is still quite significant and it would be nice to get a good chunk back while also punishing the wrongdoer --and it sounds like you want to make an example out of him.