We're really sorry to hear that you were not satisfied with the game.
Here are the steps to follow if you purchased the game on the Google Play Store:
If the purchase was made less than 48 hours ago, you can ask for a refund directly here: https://support.google.com/googleplay/workflow/9813244?visit_id=637873535298931771-1574895510&p=refundAWF&rd=1
If the 48 hours delay is passed, could you please share with us the following information throught the in-game chat?
-the detailed reason why you wish for a refund for the game
-the date of purchase
-the order number (you can find it on your receipt or on your account in the Store, it should start with GPA)
For iOS, please follow this link to request a refund: https://support.apple.com/en-us/HT204084
Thank you,