A bunch of bullcrap

Its a scam. Dont ever callback this number.

Message was left asking for a return call within 24 hours or a warrant would be issued but they did not specify the name of a person.  When I returned call they reported they were with the IRS and requested my phone number which I refused to give as they refused to answer any of my questions until they received my number.  I called from a different phone.  They kept hanging up until I unblocked the number.  

II have not received any correspondence from the IRS and do not owe them any money or fines.  

There is a fairly common IRS or "tax scam" being practiced by scammers on both Canadian and USA residents.
USA tax payers should read this:
http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

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_rev.html

Remember to return here, to 800notes.com, after you look at any of the information at that site, either to post more information, or to let us know you avoided the scam, or to read any further information about that number that others may post.

SEE:  http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

Originates in India, total scam.  Sometimes Pakistan.