i don't know how they go my number

Scam....trying to get your credit card number....offering 100.00 gift card.

SCAM. . . Message:  Calling to give you a $100.00 gift card because you visited a "website" and they are going to send their appreciation with the gift card.  Press "2" to be removed.  

I have no clue who they are or what they want. I get half a ring and they hang up. Two calls three days apart. Going by the other comments, I'm just going to block the number.

They call here let the phone ring once and hang up.