I got a call from this number - was a robotic voice mail saying something about the IRS.
I didn't call back.
Robo-Call.

got call gave me another number claimed to be irs on an important matter.  automated, suspect fraud at this time, but can find no info on this.  I doubt if this how irs would function.

Got a call from someone claiming the IRS had a suit against me.  I knew it was false and disregarded it

I got a call from this number.  THIS IS A SCAM.  I called back asked the guy if he knew that he was working from a company that is scamming people.  He was very smug and told me that he is very comfortable working for this company.  Please pass the word about these scumbags

An Indian or Middle Eastern guy called saying he was Agent Jack Williams with IRS and I also heard the word "illegal" in the message. He wanted me to call this number back. The rest was too garbled with the heavy accent and all the other voices in the background. Obviously a scam.