Well, I tried. Called the number listed. Sounded like I woke someone up. No hello, this is XXX from IRS or nothing. Thought a minute and hung up as it was certainly not in any way a courteous, or professional response to a customer.
A couple of minutes later "Lance" called back and when I commented on why I hung up he replied, "well, I'm on a job...why don't you call someone else"...which I did.
Not to impeach his service as we didn't do business, but I would never even considered it after the way this call went.