I had been getting calls like this in the past few months, maybe for about 3 days, but from a different number based in DC also.  Now, I am getting calls from this 360-562-9014 DC number with the same robotic voice speaking the script others have already described here.  I will ignore assuming this to be a scam.  I have called the number back in the past but no one answers and there is no greeting or such

TERRIBLE SCAMMER

I attempted to call back and it was a man with a heavy accent. The min I started asking questions he hung up.  I tried to call again and refused to answer.  It's a mobile number.

I asked the caller to email ,mail or fax me documents proving I have a debt. I asked how in the hell if I owed a debt from 2010-2015 why wasnt my refunds with held by the IRS. He said they don't take money for debts through your taxes. He threat me with a warrant if the supposed $4900 debt is paid in full today. I argued that I wasn't paying s*** . Then he was willing to settle for $500.then $100. To funny

Classic IRS scam.  Adding to my personal block list.