I have won 2 keys of the same game at almost the same time!What should i do?

Request a reroll.

-Edit- From one of the 2 giveaway creators that is.

REROLL DAT SHEET

I suggest telling one of the people you won from to ask for a reroll. There probably won't be any trouble getting one if you, the person who won, is asking for it, and I assume that the mods who decide whether to grant such things will be able to see that you got the gift twice.

Ask one of the giveaway creators to request a reroll.

ask for a reroll and give us a link for the private give you created ^_^

wait to get at least on of them then ask the maker of the giveaway to reroll

Ask for a reroll to one of them.

Ask for a reroll!

1) Accepted the first one you won, mark as received.
2) Contact the giveaway owner of the second giveaway and reject the gift, hopefully before he sends it. Inform him to reroll.

Do not, whatever you do, accept both wins or mark both as received. This can very easily be misinterpreted as not activating your wins, and will be served with a side dish of cold suspension.

Activate the first and ask the creator of the 2nd one for a reroll. :)