For our IOS players: Refund requests on iOS are handled directly and "only" by Apple. In order to contact them, please visit: https://support.apple.com/en-us/HT204084
Not to worry, Android players! We've got your back, too.
For our Android players: Please forward us your Order ID (it's written on your Google Play receipt and starts with GPA), we'll review it and help you as soon as possible.