Received call today from 206-201-2152 telling me to call immediately

Got a message from this number that was cut off at the beginning but said something about a lawsuit filed against me by the IRS.  Called back & got a woman with an Indian accent that was hard to understand.  When she asked I gave her my first name, but then got suspicious & asked if I could call back.  She said no, the call was being monitored & please hold on.  I figured the IRS will still be there after I check the unopened letter I have from them (which is why I panicked & called in the first place), and hung up.

Scam call pretending to be from IRS.

Received a call on AM of 7/8/2015 from 206-201-2152 with computerized female voice saying, "The reason of this call is to inform you that IRS is filing la awsuit against you. To get more information about this case file, please call immediately on our department number 206-201-2152. I repeat 206-201-2152. Thank you."

7/08/15. Robo call stating a "last notice" that IRS has filed a tax lawsuit, call 2062012152 immediately.
Male responder at said number restated IRS had attempted delivery of tax lawsuit letter (spoke in very heavily accented English), received no response and lawsuit letter was now filed in courthouse.  Identified himself as Alex Anderson, badge number IRM6264, wanted attorney information.  When pressed for more detailed information, call was disconnected.  Repeat call to said number went unanswered.
ALERT:  male responder gave accurate name, address, phone number and spouse of Meg.