Just another IRS-Impersonation Telephone Scam by the so-called "IRS - Internal Revenue Services" scammers, claiming they're going to file a lawsuit.

If you fell for the scam, report it:
https://www.treasury.gov/tigta/contact_report_scam.shtml

https://www.treasury.gov/tigta/press/press_tigta-2015-01_home.htm

You can also file a complaint with the Federal Trade Commission at www.FTC.gov. Add “IRS Telephone Scam" to the comments in your complaint.
https://www.ftccomplaintassistant.gov/

Don’t Fall for New Tax Scam Tricks by IRS Posers
http://www.irs.gov/uac/Dont-Fall-for-New-Tax-Scam-Tricks-by-IRS-Posers
IRS Summertime Tax Tip 2015-18, August 12, 2015

http://www.irs.gov/uac/Newsroom/Scam-Phone-Ca ... uspicious-Calls

For more scam info:
http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts

IRS-Impersonation Telephone Scam
https://www.google.com/search?q=IRS-Impersonation+Telephone+Scam