Don't try to chat with someone who doesn't want to talk with you. I and he just do a meaningless ping-pong game. After the game, you'll be alone and feel what nothingness is. 

He'll manage to make excuses to escape from the conversation. Then, you let him go. It's your free choice that you close your mind. 

It is also a free choice that you think that he is to blame. Well....

For the sake! Of the call!