I already talked to a lawyer about it, and you are correct to the extent it is a breach of contract. If it ended up in court, it would only be a civil suit so I couldn't go to prison (I was worried about that). The question then is just what kind of damages they could ask for. Based on the fact that I didn't abuse any competitive position, and I did my jobs to the extent that I was promoted at all of them, I don't see any damages there. But who knows how else a well-payed lawyer could try to ruin my life.