Someone else commented: Another thing to consider is that if they get a letter from a lawyer, they may just pay up. I'd start there and see what happens. Exa

Someone else commented: Another thing to consider is that if they get a letter from a lawyer, they may just pay up. I'd start there and see what happens. Exactly this. Acquirer doesn't want a lengthy case either. A lawyer will guide you to start with a demand for the full amount, else a suit will be filed. The Acquirer will probably counter with an offer and you guys can start a negotiation to end it quickly. I am not a lawyer and this is not official legal advice.