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.
Just received phone call from this number and it came up on called ID as Washington. Called stated they were calling from the Federal Government and they were suing me for non payment. Asked if I had an attorney. I said I don't owe the f..... government anything and they said just a moment let me check our records. At that point they disconnected the phone call. I am calling the IRS to report this.