Rmet has offered the best advise possible. I went through a similar situation with my husband's ex-wife, and there is nothing the courts or police can do unless there is a viable threat to your well-being. Simply ignore the ex as much as you possibly can. If you have caller ID, don't answer the phone when you see her number or an unknown number on it. Our situation was so bad that we finally had a second phone line put in and did not give her the number. The original phone number had an answering machine attached so that the ex could leave messages for my hubby without my having to deal with her ranting...the ringer was also turned off. If by chance you do have to speak with the ex, keep it professional, and if she starts ranting, tell her when your hubby will be home, to call back then, and hang up the phone. I wish I could tell you that time will make it better, but there are some people in the world who just can't let things die down.
Good luck!
Carol