Thank you all for the information.Let's stick together.

I love when you call company's customer service centers and they usually sound like Mohandas or Indira Ghandi but their names are Mark,  David,  Steve,  Jennifer,  Susan  etc,   and if you ask them where they are,   most of the time they will say  "Florida".  I have nothing against the good people of any nation or culture,  but in I prefer to employ Americans first with American Jobs.

I am receiving these calls on my work cell phone and had just spoken with the real IRS.

The IRS needs to take action against these folks.

I have a medical condition exasperated by stress.
I would like to sue.

Its probably possible to block the calls.  Ask your boss if its allowed, then contact your provider to find out how.  

Are you allowed to maintain a contacts list and assign ring tones to those contacts?  If so you can put this pest in your contacts list and assign them the ring tone "no ring".  That will send the calls to voice mail without disturbing you.

Got a phone call from then asking for my husband by name threatening to seize our account... At least that's what I think he said, could hardly understand his accent