Deleted

open as ticket to support explaining the issue also some advice always check the steam page before entering a give awya to see if the game will work in your region

Mark them 'Not Received' and continue with life. If the users keep doing giveaways that don't qualify, they get the ban hammer later.

for the second one: you can give the gift back and let him ask for an another winner for his giveaway. If I'm not wrong, giveaway creator can want a new winner to be chosen randomly

still, before doing what I suggested, you two should better contact support