I recieved a call via phone message from number 202-795-2498. Called back, talked to a would be Daniel Stuart, Badge #25173. It appears that since I was not working and haven't been for over 6 months, the call was ended quickly. It is a scam. They had also left the same message as others, which was a recording that I needed to call immediately or legal action would be taken.
I received a call from this number, and I called them back since it said IRS. The would be IRS agent "Daniel Stewart, agent # 25173) told me I owed IRS $ 2960, over 6 years, and I I didn't pay them right away I would be arrested by the county sheriff, and so on. He sounded very convincing, but what he didn't know was that the same guy called my house few months ago, and asked for a lady with spanish name for the problems. I asked him if I can called him back in 2 hours, and he agreed. I went to google the number, and I found out about that scam. Thanks for everybody who posted their encounters with those thieves.