I also receive calls from this number and a few others. I'm 90% positive that it is related to a form I filled out at Bass Pro to "win a gift card". Here are the other numbers who have called me: (310) 429-5382, (540) 878-4627, and (971) 270-1504. All trying to sell timeshares. What I finally did was to create a new contact in my phone and named it "Spam Caller". I have a setting that you can choose to send calls from a certain contacts directly to voicemail. So if they call from a new #, I just add it to the "Spam Caller" contact info. They will continue to call for a couple of days, but I guess when they realize it goes directly to voicemail they give up and it is months before I will get the calls again from a different #. Even if your phone dosen't have the "send to voicemail" option, if you at least create the "Spam Caller" contact in your phone and save their numbers, at least you know not to answer it. I say shame on Bass Pro.
I also signed up for a sweepstakes from Bass Pro Shop about 2 years ago. I'd received a few calls about a year ago. Now just this week, 971-270-1504 number has called my cell twice. They don't leave a message.