apparently a scam-rec'd text that I won $1000 giftcard to use @ any Walmart store

Rec'd text to contact this vendor thru website wmart-giftcard.com- Ph # rec'd from is not a working # - the # is 949-294-7430.  Mssg also suggested texting 'OUT' back to them. Did not do that.  Like others, the text said I had won a $1000 giftcard at Walmart.