I think it is awful what has happened to you.  I 
think you should post the URL of their website 
and outright name them. Why? Because a forum for 
collectors should be a warning zone for other 
collectors to stay away from con artists and/or 
otherwise nasty people.  While I've never been a 
victim of fraud, I know many people who have. 
I've been very careful to keep my eyes open and 
network with other people so that I could know 
who to stay away from.  You have had direct 
dealings with this person, so your information is 
not hearsay and would be valueable to other 
collectors.