I had this come up personally on a construction project recently. Thankfully there is a contractors board to start with who will give a costly citation to the culprit…a second complaint can put the offending party in jail. Outside of that it is going to be up to me to take legal action. In terms of technical projects, however, your options are probably dictated by whatever contract you legally entered into, though everyone and anyone can certainly try to sue. The best thing to do is to document dates, dollars, and conversations. Having that information organized and at the ready is always your best possible situation to be in and can serve you well if legal action is the final recourse.