MY.GAMES Market
You are welcome to reach out to us through the MY.GAMES Market support section. Please specify what issue you are facing with your purchase and what prompted you to apply for a refund. Attach a screenshot of your payment for your inquiry to be addressed quickly.
We will consider your complaint to see if we can or can't help out with your refund request.

In-App-Purchase through an Application Store (Google Play, App Store)
If there is an issue with a purchase you have made or are planning to make in the game, please launch the game on your device and contact us through the following method: Settings → Support.