Ha, I say to tell them if they want to speak to someone who cares press 1, if they want an answer there is a 45 min.. wait. we appreciate your call please hold on for the next available ...... That should about do it!
I am an extrovert, but I have many beloved introverts in my life. It's a myth that introvert simply means "shy." These folks just prefer to process things internally before they're ready to talk about them. And when they do, it can blow you away. My brother, for instance.