Woman was incredibly ignorant - says her name is Sarah Smith of national recovery corp. Would not help me to guarantee some information she had first so that I could prove she wasn't a scam.

Very Rude caller named Sarah Smith called asking for my grown sons information and making threats of repeated calls if I don't comply . He doesn't live here .
I'll call the Brantford Kitchener Police on her if she continues .

The same woman, "Sarah" was not willing to verify the name of the company so I could confirm it wasn't a scam,.. She called me on my work phone number asking me to verify my mailing address information and the person in charge of payroll. She was surprisingly aggressive when I refused to give her any information.

The exact same number called my mom and the same person was on the other line, she said she was from the National Research Council (which is an actual organization). She wanted to confirm her address and started by asking if the address she had was her address. Obviously she had the completely wrong address, baiting my mother into giving her actual address.
I googled the actual contact info of the NRC and it's a 613 number located in Ottawa.
My guess is that this a scam and it's to do with identity theft.

Left a message saying that [Name of Debtor] should return the call, at the number.  This company seems to be too cheap to give out a 1-800 number for callback purposes, and I intentionally have my phone set up to only dial out local calls and 800 numbers only.