The purchases you make inside apps are controlled by the app stores. This means that all charges and fees are applied by them, according to your device's model.
Apple is the one responsible for purchases made inside iTunes, and Google the one is responsible for purchases made inside Google Play. Since we do not receive any direct payments, we are unable to provide refunds!

Items bought through downloadable games (in-app purchases) are generally non-refundable.
There are special cases where a refund can be granted by Google or Apple. We kindly ask you to contact Google/Apple support team if you need to request a refund.