First I got a recorded message saying IRS was filing a law suit against me. Called number back, asked what company they were with and I was told it wasn't a company but a department with IRS and that I had been under paying my taxes for the past 5 years. I asked to speak to a supervisor and was asked why I wanted to speak with a supervisor. I responded because it was a "bunch of crap". The response I got was "it's not crap" and they hung up. The phone caller was female with an Indian accent. I have blocked the number.

Says they are IRS and are suing for money.

Received same scam recorded message, claiming to be the IRS and they were suing.

This caller is calling identifying their self as irs, saying irs has a law suit against you. Totally false

Looks like these 'IRS' scammers are using more than one phone # using different area codes.  I received 2 calls from #215-688-5479 yesterday (Jan. 23) in less than 3 hours (9:30am & 12:15).  Caller ID showed 'Unavailable' but also shows their #.   Recorded message left on answering machine said:  "...Internal Revenue Services......The reason of this call is to inform you that IRS is filing lawsuit against you.  To get more information about this case file, please call immediately on our dept number 215-688-5479.  I repeat  215-688-5479.   Thank you."
Makes you wonder how many more phone #'s, area codes, they are using.
I've blocked this scammer.