One thing to keep in mind is that a number of businesses incorporate in Delaware because Delaware law is very protective of owners and their privacy. The corporate veil, as it is called, is very strong in Delaware. For example, in Delaware you are not required to disclose who your corporate officers and directors are. They believe in litigating in front of a judge instead of a jury. They also believe corporate law should follow precedence over litigation.

My point being, you probably won't actually find a lawyer who will take your case. My non-legal, just a guy on HN, opinion is to cut your loss and move on. I'm sorry to hear about this level of dishonesty in a business, but don't throw good money after bad.