You can call 1-800-366-4484 or report it at........treasury.gov/tigta/contact_report_scam.shtml
This information was in April issue of Costco magazine. I received same call last week. It was a recording
left on my answering machine.
This number called me all day. Saying I was being sued by the IRS and was going to jail if I didn't return there call. I was ready to throw my phone outside they called me at least 12 times very annoying. They kept saying they where the IRS