http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
http://800notes.com/forum/ta-8c2f64bf2b91fa5/irs-warns-of-telephone-scam

Report the Calls to the real IRS here:
•report the incident to the Treasury Inspector General for Tax Administration at 800-366-4484.
•You can also file a complaint with the Federal Trade Commission at FTC.gov. Add "IRS Telephone Scam" to the comments in your complaint.

******
Do consider getting a call blocking device or phone.. You can google them and many are around $50.00 or so.If its a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.

Same as all other comments,man with accent, left same message as others have reported

Same as the others...last three days 3 messages per day.

Same as others. Had guy with a terrible accent and sounded like he had cotton in his mouth call three times within a 4 hour span. Claiming if we ignored the call, we would be arrested. Blah blah blah. Get a real job. I'm blocking and reporting.

I really cant add to what was said above. It was as was said above targeting my elderly mother, who went ballistic. I called the FBI  and they said it was a common scam every tax season.