I just got a call from this number as well. There was a message left that said it was the IR S final notice that they were going to file a lawsuit against me. I called it back and the phone was never answered. It just rang and rang
Yes, I also received a call from this number stating it was "officially a final notice from the irs" who is "filing lawsuits against" me. Looked it up and found this post. It's a scam. I didn't bother to call back.