We are sorry that you don't like what you've purchased.
Please let us know why you don't like it by writing us at email@example.com
As for the refund, please see the following steps and link for more reference.
How to get a refund using iPhone or iPad:
1. Launch Mail from your Home screen.
2. Search for "Your receipt from Apple."
3. Find and tap on the receipt for the purchase you want refunded.
4. Tap Report a Problem next to the purchase you want to get refunded.
5. Enter your App ID and password
6. Tap Choose Problem and select a problem from the menu.
7. Enter details for the problem and tap Submit.
For refund on other devices, please check out the website
for more reference.