The number is 573-202-6384. The caller left a message saying the IRS was filing a law suit against me and then left a number for me to call. I don't think the IRS calls to tell you they are going to sue you, they just do it! The number has shown up several times on my caller id, but I do not answer. Today was the first time a message was left.
They'll call and call and call until you answer their question. That's threatening in and of itself. I just filed a complaint with the Missouri Attorney General's Office and suggest EVERYONE does the same.
This number has been calling a LOT and I don't recognize it so I never answer. Now that I know what it is, I'll block it. You can too if you have AT&T!