If you haven't received your purchase, please report the issue to Apple through the following steps:

1. Visit Apple's support site: https://support.apple.com/
2. Select 'Apple ID'
3. Select 'iTunes Store & App Store'
4. Choose the most appropriate topic for your issue

Android

If you're an Android player, please refer to this article: Android Refund Request

Kindle

If you're a Kindle player, please refer to this article: Kindle Refund requests