They stated they were from the IRS

I received a call from this number but there was no response when I answered. I called back and the guy answered IRS. I asked his name and he said "f you "

I got a call from this number in Seattle but missed the call.  Called back and the mildly accented person stated that he I had called the IRS.  Any contact from the IRS to me or my company would come from Austin or Ogden, Utah so it is obvious that this is from some type of Scam artist.

I told him to get off my phone and never to call me again and that I would report the call.

IRS call

There are numerous telephone and email scams in which individuals claim to be employees of the Treasury Department. These scammers often state that they are from the “Department of Legal Affairs,” offer grant money in exchange for you wiring a small payment, or threaten to arrest you within a short period of time unless payment is made. Do not provide personal information or payment to these individuals.  Their actions are crimes under Titles 18 and 31 of the United States Code, and the Treasury Office of Inspector General is working to stop them.

If they claim to be from Treasury, report  it to OIGCounsel@oig.treas.gov with a description.  If it was a phone contact, include:
the exact date and time that you received the call(s)
the phone number of the caller
the geographic location and time zone where you received the call
a description of the communication.

If they claim to be from the Internal Revenue Service (IRS) or it is about taxes, report it to the Treasury Inspector General for Tax Administration at:
https://www.treasury.gov/tigta/contact_report_scam.shtml

https://www.treasury.gov/services/report-fwa/Pages/Report-Email-Scams.aspx