I knew this was a scam so I had a little fun. I started calling the number back as many times a day as it has been calling me and harassing the people that pick up. It's fun placing food orders and telling them fake stories about my day. The number has since been disconnected. I miss my friends from the "IRS"
I wouldn't consider anyone innocent that answers claiming to be the IRS when I call back and asking for personal information used in identity fraud. Feel free to allow these "innocent" people to call you all you want. I got them to stop for a change.