Wow,
  Nothing like this has happened to me [yet], and 
I sincerely hope that it never does.  But I must 
admit that this is one of my primary concerns 
when dealing with deputy services.  If your case 
is unsucessfully resolved with whatever deputy 
service you were using, you might want to go 
ahead and give out their name, as they are 
obviously untrustworthy and should be avoided by 
other buyers...But only do this if it's obvious 
that they were trying to rip you off.