You should all get together and try a class action suit. This is pretty much fraud. Other than that all you can do is vote with your dollars... don't buy from them anymore. If everyone that they cheat stops buying, and the story spreads they'll eventually close. It's sad that they ripped off so many people, but there's not much you can do. Going to a convention and telling your grievances to a minimum wage flunky isn't going anywhere. They aren't going to bother sending that up the chain, especially if they need the job. That person working at the booth didn't screw you and don't have any power to help you.