I got a voicemail from this number stating that I am being sued by IRS but left no name just a number.
No details sounds like a scam, I also found on google an apartment listed under this same number in DC.
202 747 2151
I also searched white pages nothing is listed under this number, so if it was an official office it would automatically
come up.

Yeah they called the house and since I have gotten this before I immediately told him off saying the real IRS sends letters and that I am responsible when it comes to my taxes. He got pissed off and called me a name.

Report the Calls to the real IRS here:

IRS:   http://www.irs.gov/

http://www.irs.gov/uac/Report-Phishing
phishing@irs.gov
http://www.treasury.gov/tigta/

http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
http://800notes.com/forum/ta-8c2f64bf2b91fa5/irs-warns-of-telephone-scam

?If you owe federal taxes, or think you might owe taxes, hang up and call the IRS at 800-829-1040. IRS workers can help you with your payment questions.
?If you don?t owe taxes, call and report the incident to the Treasury Inspector General for Tax Administration at 800-366-4484.
?You can also file a complaint with the Federal Trade Commission at FTC.gov. Add "IRS Telephone Scam" to the comments in your complaint.

I missed his call and i call back this number and he talked to me exactly same way and threatend me I will be arrested witihin two hours and my citizenship will be cancelled .

See:  http://www.irs.gov/uac/Newsroom/IRS-Warns-of-Pervasive-Telephone-Scam

same call received 15 mn ago shawn davis indian ascent irs get complain against me SCAM

I had several call (a guy with Indian accent) in the last few days from this number also stating there is a legal lawsuit against me from IRS. He stated that his name is Shawn Davis. When I asked him if he is referring IRS as Internal Revenue Service Government Agency, he claimed yes. I asked for his identification number and stated that I never received any letter from IRS, he immediately said that the police will contact me and hang up. It definately sound like a Scam and I could hear background noise just like Telemarketing offices.

I had several calls (a guy with Idian accent) in the last few days from this number stating a legal lawsuit against me from IRS. When I told the caller that I have not received any letter from IRS and I will contact local IRS office to confirm it, the line is silence. sounds like a scam.

Received several calls from this number stating a legal case is pending by IRS.  This is a scam.