What should I do when my new husband insists on being friends with his controlling ex?

I have been married for one month. My new husband has been divorced from his ex for 13 years. They have a 15 year old daughter together. My husband's ex wife married the man that she had an affair on him with and now they have a child together. My husband has maintained a friendship with his ex wife and her new husband for 13years. She is very controlling and has always called and text him with anything she has ever wanted to talk to him about. Now that I am in the picture she has continued to call and text him on almost a daily basis. I text her one time to ask her to please stop because it was causing problems in my new relationship. I was very nice, but she became so upset that she blocked my husbands daughters phone from me. My ex refuses to tell her that her persistence is causing problems because he doesn't want to cause an issue for his daughter who lives with the ex. I am tired of being treated like i am second. Any suggestions?