"-"

Check your email or contact with GA creator. But do not rush him, 'cause he has a week to deliver the key

might be a gift...have you read the GA description ? xD

Keep in mind, the giveaway creator has 7 days to deliver your win.
You can leave a message in the giveaway itself explaining what happened.

Outside of that, be patient.

FAQ

If I win a gift, when can I expect to receive it?

• Giveaway creators are allowed one week to send the gift after the giveaway has ended. Depending on the type of gift and the giveaway creator, you might receive the gift to the e-mail address you have listed on the account page, a key might be added beside the gift you won, or the giveaway creator might have sent you a friend request on Steam to make the exchange. Please remain patient, and do not contact the giveaway creator during this time. If the gift is not received after one week, you can mark the gift as not received, and attempt to contact the giveaway creator on Steam to follow-up.)

How long has it been since the giveaway ended?
The giveaway creator has to click "send key". If he/she is not online or has too much other stuff to do, he/she might not have clicked "send key" yet.