You can file a complaint using the FTC Complaint Assistant; choose “Other” and then “Imposter Scams.”
If the complaint involves someone impersonating the IRS, include the words “IRS Telephone Scam” in the notes.
https://www.ftccomplaintassistant.gov/Information?OrgCode=IRS#crnt&panel1-1
Call from 415-363-0164. Said I was being sued by the IRS. I called them back from a different number and could barely understand the guy saying he was from the IRS. Hung up and blocked the number and then reported it to the US Treasury.
Yeah ...it's getting quite ridiculous ,I guess if they call all day they get some people to go for it ,Wanted a money orderfor $4000 will not give me a case number either.