If you call back, be sure to use *67 in front of the number so your number isn't viewed by them.  Otherwise, they know your number is legit and will call you over and over again.  I called the number back with *67 and told the heavy accented man to get a real job.

You can see on mycallbot.com that 800notes.com has been receiving complaints against this number since 3/23 (count = 4) and mrnumber.com has been receiving them starting the same date (count = 12).
I've submitted a complaint against 703-828-0433 on the National Do Not Call website.  It's easy:
https://complaints.donotcall.gov/complaint/complaintcheck.aspx

I suggest that more of you also add your complaint on that .gov site to get that fine elevated.

This company has called me three times today, leaving a message each time.  I just delete them.  I really don't want to talk to them I'd just like them to stop calling.  If I ignore them long enough will they just go away?

I received 3 calls from 703-828-0433 - when I finally answered a man with a heavy accent (Indian, Pakistani, Afghani) identified himself as Mark Davis from the Internal Revenue Service.  After demanding to speak to his supervisor or be given a number to call back to he refused.  He continued to threaten me with criminal action unless I paid $1986 for tax penalties from 2008-2012.  I hung up on him, he called again but did not leave a message.  I am also reporting this to the IRS

They had wife's cell phone, daughters name and our address. Indian accent. Claimed to be IRS. I gave them no info and confronted them about being a scam. They hung up.
I'd like to hang them up...