Phone scams/telemarketing fraud should be reported to the U.S. Federal Communications Commission (FCC) at 1-888-CALL-FCC (1-888-225-5322) voice or 1-888-TELL- FCC (1-888-835-5322). You may access the FCC web-site at www.fcc.gov and file a complaint using the FCC online form: http://esupport.fcc.gov/complaints.htm
Claimed to be from IRS delivering my final notice before filing lawsuit. I asked for mailing address. They seemed confused and hung up. I reported them on IRS website