Sorry to hear about your trouble israeli32.

If you definatly cant get them to pay for the content, and their is no legal solution to the problem, i am sure another webmaster will take the content off your hands. If you dont want to loose as much money you could sell it as semi-exclusive, maybe 3 - 5 times, so you can get your money back, other webmasters can get some good content, and they person who scammed you wont actually have "exclusive" content if he/she chooses to use it.

Just a suggestion.

Hope you manage to get things resolved.