I got a call from them last night on my answering machine. I called back and got to a person. They claimed to be Officer Kim Tyler (with an Indian accent), and badge number IRM0156, and that I was having an arrest warrent issued in my name for my taxes from 2008 -2013. I did not get to the point of them asking for money, though they told me how much I owed. I am now calling the Federal IRS number 1-800-829-1040 and posting a complaint, and giving them all the information I have.
This kind of stuff sucks, and the FBI should be cracking down on these bozos.