If you haven't received credit for completing an offer from Adgem, please wait 72 hours as there might be a delay from the provider's end.
If 72 hours have passed, use the submit missing rewards to contact Adgem:
Go to the Quests section in Klink app, then select Adgem in the Ecosystem Partners, then tap the "My Offers" button on the bottom left.
Select the game that has reward issue.
Scroll down a bit and tap the "Support" button to redirect you to their support team.