Who called from 2131415163

did not talk to them, it was a message left on my phone but I could tell it was a recording, a man w/ a deep voice.

received a phone call from this number saying they were the IRS and they were going to sue us.  Very alarming.

I got a call from this number, it was an automated call that told me a lawsuit was filed on my by the IRS and to call 209-813-4131, which I did from a private line.  They were asking questions.  I told her I wasn't stupid.. call ended pretty quickly

Called left automatic com saying he's an officer from the IRS and they have a law suit against me.

Number left robo-call voicemail saying it was the "Internal Revenue Services" (yes, plural) giving their last notice of their "lawsuit against" me. Just so everyone knows, the real IRS sends you notices by mail and when they take action (from what I hear) you'll know it by wages garnished, accounts frozen, or maybe a real live agent showing up at your office.
Whoever this scam outfit is, I'm pretty sure the real IRS doesn't want other people's goons bullying in their name...as the bumper sticker says, "the government hates competition".