Who has this number?

I received a call claiming to be the IRS they want me to call back I believe it's a bogus call

There is a widespread IRS (or CRA) or "tax scam" being  practiced by scammers on both USA and Canadian residents.

USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/Phone-Scams-C ... 5-Filing-Season

Canadian tax payers should read this:
http://www.cra-arc.gc.ca/nwsrm/lrts/2013/l131210-eng.html

Short answer:
The IRS never initiates a contact via phone.
They always send a snailmail first.

Educational post:
This scam is also described as scam #11, here:
http://phonehelp.2truth.com/facts.html

If you were contacted by an IRS impostor, you may file a report, after clicking on this link:
http://www.treasury.gov/tigta/contact_report_scam.shtml

UPDATE:
Recent news story:
http://www.wltx.com/story/money/2015/03/12/fa ... -scam/70202814/

Thanks for the info. We received a call this morning at around 8:00am saying we were being sued by the IRS. We have already filed our taxes and gotten a refund. We were pretty sure this was not legit.

I keep getting call from an unknow number asking me to call this number 360-807-5517 it state that IRS is filing a law suite agent me and I need to call this number. When calling this number you get no answer. This is the second time I have gotting a call asking me to call this number.