I have called them back but they keep hanging up on me.  Apparently they don't like to be harassed by phone either

IRS calling

MY DAUGHTER RECEIVED THE SAME CALL. IRS DOES NOT CALL THEY MAIL LETTERS.

I juist recieven a call From them.  They have an address of mine from 10 years ago, when i ask why they didn't send me a letter notice they claimed the tried at that address.  FYI if the IRS wanted to find me they know where I am.  Trust me they know.  Its a scam, they wanted me to leave work and drive to CVS to purchase ab electronic card for payment.  UGH i want to get them so bad.

Received the same call...IRS calling, final notice, filing a lawsuit against me. Called back in less than five minutes (they left a VM). No one answered.