I agree with dorton to stop taking his calls. There's nothing positive from them and they're all manipulative. Knowing that, it begs the question "why do you answer those calls?"
My experience with my daughter was that I answered because I was addicted to her, addicted to the drama, and I felt horrible when I didn't answer. Like I was letting her down. I made it all about me because I didn't like and couldn't stand feeling uncomfortable about her. My ego was out of control.
Just something to think about.