I just got a robo-call from a guy with an Indian accent who claimed he was from the IRS. He threatened me with arrest for tax fraud unless I called him back at 703-665-1141. I reported it to the Federal Trade Commission at: https://www.ftccomplaintassistant.gov/#crnt&panel1-1.
Also reported it to the IRS (see:
[email protected]) by forwarding the text/voice mail message as-is to the Internal Revenue Service at: 202-552-1226.