This number keeps sending me text messages I just want them to stop. Please Help!!

Texted me to call 877-711-5429 for a "free" $100 Wal-Mart gift certificate because "I completed their survey."

I can't remember completing anyone's survey in years.

Also got a text to call 877-711-5429 to claim a WM gift card

Text Msg: Thanks 4 Visiting Our Website Please Call 877-711-5429 To Claim Your $100 Walmart Gift Card Voucher...
Called them but they couldn't tell me what websited I visited to receive the card.  In order to receive the Gift you must answer a 5 question survey and pay them $2.95.  They will send you a list of vendors that will accept the card.
I asked for their website, it is rewardscash.com
Not sure of the catch, but my guess is you pay $2.95 and never receive the card.

Got a text message from 1-415-601-9655 saying "Thanks 4 Visiting Our Website Please Call 877-711-5429 To Claim your $100 Walmart Gift Card Voucher! Reply STOP 2 Unsub"  What website did I visit and give them my cell phone number?  NONE!