All you can do is contact support proving you've tried to contact them multiple ways in hopes for a reroll or for received feedback.
Comment has been collapsed.
If the keys are visible to them, there're high chances that they might have been used on other accounts.
Gather proof that you sent the keys, and that you tried to contact the winners, then create a support ticket for "Request Received Feedback".
Comment has been collapsed.
14 Comments - Last post 3 minutes ago by Kyog
461 Comments - Last post 18 minutes ago by y2alex
857 Comments - Last post 1 hour ago by sensualshakti
82 Comments - Last post 3 hours ago by AkulahArjuna
212 Comments - Last post 5 hours ago by DVDVD
372 Comments - Last post 5 hours ago by CeleryMan727
115 Comments - Last post 5 hours ago by CeleryMan727
1 Comments - Last post 5 minutes ago by Moogal
12 Comments - Last post 20 minutes ago by UnbakedBacon
62 Comments - Last post 38 minutes ago by 1stCheater
26,504 Comments - Last post 41 minutes ago by schmetti
633 Comments - Last post 44 minutes ago by Yoshi100
2,711 Comments - Last post 56 minutes ago by actuallySIG
134 Comments - Last post 59 minutes ago by Carlo
There are two winner in my giveaway : https://www.steamgifts.com/giveaway/TN2WT/hero-battle
I saw they are online many times, and tries to contact them through SG and Steam, but receive no response.
I didn't find they own the game, so they might not see this or they sell the key.
What should I do?
Comment has been collapsed.