I think you're correct, Gary H.  We get NUMEROUS calls like this; also "free" pain ointment, medical alert scams, and "free" back braces.

Called Texas Landline Wed 20 Dec11:09 a.m. Caller ID Display "WIRELESS CALLER"
I answered "Who's calling?" He said David Porter of INDEPENDENT HOMES." He wanted info about bathtubs whowers safe walk-ins I had in home, I said "Take This Number Off Your List."  He continued about  bathtubs whowers safe walk-ins, I repeated "Take This Number Off Your List.". He continued about  bathtubs whowers safe walk-ins, I repeated "Take This Number Off Your List.". So you get the gist. I called the number back but no service no answer= prob spoofed. They called me Oct 2016:
http://800notes.com/Phone.aspx/1-620-339-0123/2#p1113167356491516401