Left a message stating it was the final notice before the IRS sued and to call them back immediately at 201-312-4474. Caller ID said Wireless Caller with this same number.
I too received a voicemail from this # saying I was getting sued by the IRS. I did call them back and got an Indian fellow by the name of "Shawn White" who told me I owed over 2k in back taxes and if I didn't pay them, I would have an arrest warrant out for me and my driver's license would be suspended and my house taken away. I played along and said if I wanted to pay, where I can do that other than by phone and they said that I could ONLY pay by phone or else be arrested. I refused and said that was against the law and he threatened me that I'd be arrested at my house within the hour and hung up on me. I really hope other people don't fall for this scam.