Received three automated calls from this number, stating "Hello, we have been trying to get a hold of you. This is the IRS, the Internal Revenue Service. This is your final notice, etc..."
I finally called them back. I got this kid with a thick NY accent answering the phone like, "Thank you for calling the IRS, how may I help you?" When I told him that I did not believe he was IRS, he just asked me for my date of birth. I gave him my phone number (since he already had it) and told him to take me off his sucker list, cause if he didn't I would call the police, the Feds, the IRS themselves and anyone else I could about them.
Blocked 'em!