I got call from 213-283-7078.
The caller called himself Jimmy Arthur from IRS.
He tried to collect $5,800 as a fee for miscalculated TAX for the period of time between 2008-2014.
He also talked to my mom and was forcing her to pay off the debt in 48 hours.
He knows my home address, my name and home phone number. He tried to solicit as much of my personal information as possible.

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.

i received a voicemail from this number.  i was "approved" for  loan ranging from $500- $15,000 with  3% interest rate.  Really????????

(pretend that you have a Rajesh   {aka: Steve with at&t cust. service}   accent when you read this)    
Yes,  they are wonderful peoples and saved me from my issues by giving me a government grant for 10,000 usd and settled my issues with the IRS.   They helped me by reminding me of all of the pay day loan debts that I owed for 10 years and  forgot about.  Then they arranged for a computer specialist from Microsoft to seize control of my computer and resolve my virus issues.    Thanks IRS repr. for helping me with my issues.....

I have been calls from this number 213-283-7078
Every day and night for one month now.  I never take the calls I placed a block call on  my phone for this number hopefully one day they will just give up!