Four calls/messages today between 1:20 and 4:00.
Indicate they are IRS - final notice regarding a pending law suit against us.

BEWARE!  Its a scammer calling you!The IRS doesn't initiate contact with taxpayers by email, text messages or social media channels to request personal or financial information. In addition, IRS does not threaten taxpayers with lawsuits, imprisonment or other enforcement action. Recognizing these telltale signs of a phishing or tax scam could save you from becoming a victim.
See: How to know it’s really the IRS calling or knocking on your door

Called and left a message saying they were the IRS and sueing me. I called back and an Indian guy asked for my first and last name, & told him I need to see if this is the IRS first. He stated his first and last name and some fake ID number. I told him I was told the IRS would never call you like this and he told me to "have a nice day ma'am" and hung up! Lol

Called my DNC registered landline 6/28. I was on vacation. IRS scammer left voicemail.
“Hello we have been trying to reach you this call is officially a final notice from IRS internal revenue service 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 department number 646-971-1510 I repeat 646-971-1510 thank you…”

The Whitepages states. The subscriber number for the given number is invalid.