Please note that refunds are handled by the respective platform's stores:
Google Play
Please refer here for steps on how to refund.
Apple App Store
The iTunes Store Terms and Conditions specifically states that: All sales and rentals of products are final.
However, there are methods online that mention of refunds. Do feel free to look them up.
Our team is also prepared to troubleshoot for you, in the case that you prefer checking an error than refunding the game.