Callers are located in India and Pakistan. US can't do anything and the local governments do little. Call blocker's your best bet. And don't pick up on call numbers you don't recognize.
Same threats as all the other posts but used telephone number 631-573-1138. It's a dangerous scam. US Treasury (IRS) never calls you. They always contact you by mail. I've been advised do NOT respond to this call and give no one your personal info.