Not that I don't feel for ya (because it actually sucks) but unless you have a copyright on it and it's posted on the net.. It's fair game... Hell even if you do have a copyright folks will still have their way with it... Look at Cajun Archery's logo.. That is one of the most infringed logos out there in the bowfishing community...
Maybe they have the same graphic designer that didn't want to do any more work and sold them yours.. LOL