I just got the same call with the same message as Alex!. When I called them back, "Richard" told me he was notifying me that due to my debt with the IRS he was sending law enforcement team to arrest me. A warrant has been issued, I will spend three years in jail, all my bank accounts will be closed, they will take my car, house, and another belongs of value, I would lose my job and I will never be able to work anywhere else in the United States ever again! Then he asked me what I wanted to do? I asked him how much I owed? He said, $1400. I said, I'm going to jail over $1400?
I asked him if this is all true, (which I knew it wasn't), what are my options? THEN he got to what he wanted....MONEY! When I told him "I only have $25" he hung up on me! It was fun while it lasted!