Aha, that would explain it. I also entered a truck giveaway at a mall. They don't leave any messages and there's no way I'm picking up the phone for someone named, ahem, "Kizzy George."
This is indeed a sales pitch call. They, "Outdoor Adventures Inc.", receive your number by you angering to "win" a truck at mall and other locations. Every entry, within their guidelines, will receive one of a "limited number" of keys to try in the truck after a two hour sales pitch to buy a membership in their resort. I'm sure people actually do win occasionally, but unless you want to spend almost $7000 for five years of camping... well, you get my point.