Emotions are the enemy of negotiations. There's attitude aspect here you must be careful about. If you think you're in a for a legal battle, you'll get one.

Emotions are the enemy of negotiations. There's attitude aspect here you must be careful about. If you think you're in a for a legal battle, you'll get one. You'll lose time, money, & energy-- the attorney still gets his fee. You must talk with (not email) these folks to get paid. Preferably, go see them in person. Turn this conflict into an instance of advisement. Find out what they want. Stuart Diamond has some excellent advice on negotiating> https://www.youtube.com/watch?v=ZOZo6Lx70ok https://www.youtube.com/watch?v=ZOZo6Lx70ok