PSMKay's advice is perfect, but I would like to tack on one additional thing.
Theatre (even volunteer-level community theatre) is a heavily reputation-driven profession. People who are impossible to work with (for whatever reason: flakiness, rudeness, creating drama, refusing to work with directors, substance abuse, whatever) are punished in various ways: they develop a stinky reputation, they start off on the wrong foot with directors, they find much less support in times of unemployment and personal crisis, they lose out on parts ("I like them both, but I've heard horrible things about Janice..." is a perfectly valid reason for giving the role to the other person, and happens more often than you many people realize), they aren't invited to audition in the first place, they aren't asked to join standing companies, they aren't brought in when new companies launch, and, ultimately, their careers end that much sooner.
It can be very tempting to be vengeful with people who have wronged you, and under the circumstances you've described, you have a right to be upset, but involving yourself further in this situation is going to be expensive, time-consuming and probably fruitless, and this will frequently be the case. However, the actors will not escape from this situation with untarnished reputations, and in many respects this is even more damaging than anything you could actively do to them.