Scam call from "Internal Revenue ServiceS". The real Internal Revenue Service (note that it's singular) does not call people to threaten to sue them out of the blue.
Scam call claiming "we've been trying to reach you" and this is "final warning" Internal Revenue ServiceS is filing lawsuit. Whatever. I use a CPA - complete scam - why I never answer my phone.
Robocall said IRS was about to file suit against me and this was my last chance. They didn't say they were from IRS so I imagine they offer accounting or other services