I just received a call from them 20 minutes ago. I just laugh and hung up. 100% SCAM!! The IRS will contact you thru the U.S. Postal Service. And if you're going to be sued it would be a certified letter send to you.
Contact the FTC with all the info you have. There seem to be multiple numbers, names, voices, etc. Losers. One left a message saying they were from the Internal Revenue ServiceS. It's Service. And the IRS doesn't sue...they garnish.
They left a message on my answering machine saying the IRS has filed a lawsuit against me and to call 202-684-3502. The call came from either 895-093-8944 or 855-876-5380. I do not answer my phone because of all the calls I get from unknown caller or unknown name unless the caller is someone I know. My name & number is on the DO NOT CALL LIST.
Susie, these people are calling from another country and probably don't even know about the Do Not Call Registry. They are frauds. Do not answer their calls and do not give them any money. Read over the various posts and see what is happening. There is a lot of great advice on this site for how to proceed. Good luck!