Got the same thing, about winning a best buy 1000.00 gift card, in a TEXT at 2:31 A.M. I was really ticked off, as it rang on my cell next to the bed. Woke my husband, who had to get up very early. When you call the number, it says the mailbox is full. when you text STOP back, it says it is an invalid number.
Same thing, but in a Text at 2:31 in the morning! you cannot leave a message on the number, and when you text 'STOP'back it says unable to deliver due to invalid number.