so after I discovered these guys are just complete a**holes trying to get your money, I called them agin and when they said IRS I said "this is not the number to the IRS"
they said "you don't know that "
and I said "I do, and this is not the number"
so the guy said F*%$ you B*tch and then called me an a** hole. I told him he did a great job with using his engrish to fraud people, and if that didn't work, insult them.

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

Report the Calls to the real IRS here:
•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.

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Do consider getting a call blocking device or phone.. You can google them and many are around $40.00 or so.If its a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.

I received the exact same call and threat and then hours later they are calling and hanging up .... about 5 times in a row just calling and hanging up

they called me twice today too, same computer recorded message about owing IRS and that call is urgent.

This number is in GLENDALE CA. The IRS does NOT make Collection calls - as mentioned by CWG40 above.
Even if they did, they would NOT be calling from GLENDALE CA and definitely not via a CALL CENTER in INDIA!
Make note of this number and next time it calls,  DO NOT answer - let it ring. NEVER answer any calls from unknown numbers. A  city / state caller ID is ALWAYS a scam - never answer those calls.