The third party service between the game where you want to get free resources, and the app where you need to complete the mission, is Fyber.

Fyber has its own database, and we are not responsible for the resources earned through Fyber's reward system.

If you are sure that you have completed the task correctly, please contact Fyber directly about your missing gems by following the steps below:

Go to the Fyber Offer Wall within the game, and tap the three-line icon at the top left of the page to view a series of options:
Select “Status” and see the status of your reward:

If you would like to file a report for the offers for which you did not receive gems, press the following button to report, and Fyber will send you an e-mail reply with a case number. Follow the instructions in this email so that Fyber can help you resolve your case.

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