phony IRS scam

Keep getting theaterning and harsing messages from these [***] at 202-241-0343.
There criminals need to be locked up by the FBI...along with anyone selling our phone numbers to these terrorist. I hope when Trump gets in the Whitehouse he goes after all these criminals

First, no one is selling your number to these scammers except maybe other scammers. They use computers that call numbers in sequence so unless they have your name, it is highly unlikely they got your number from anyone. Second, these criminals are operating from a foreign country and it takes cooperation from that country to shut these scams down.  Recently India arrested a group running this type of IRS agent scam but there are many more out there still not caught and new ones rapidly replace those caught.

The message said we were getting sued by IRS

Same--just called me.  I'm guessing it's a scam!