If it looks like you got charged but didn't get your items (check first in the menu 'Open Goodies' in the in-game Shop), or if you got charged multiple times, please use the "Contact us" button below. Make sure to provide a proof of purchase (e.g. a screenshot of the receipt or confirmation email) and a timestamp.
If you wish to request a refund for a purchase made on an Android device, refer to this article: https://support.google.com/googleplay/answer/2479637?hl=en
If you made a purchase on the PC (GOG) and you wish to request a refund, you have to contact GOG Support (https://support.gog.com)