I just called the number back from an alternate line... it's the Walmart $100 gift card activation line...
These scammers are somehow using their system, so that's not actually the phone number they're calling from. The man on the line when I called back was very apologetic and said that they have made reports and it's been going on for weeks and they haven't stopped it yet.
I say call the number back from a blocked line and file a complaint to encourage whoever is running that walmart line to nix this.