Regarding KineMaster subscriptions purchased through the App Store,they are handled by Apple and it is out of our hands to proceed with any refund. We can only recommend you to contact Apple support directly, providing them either a screenshot of the issue or the reason why you are asking for the refund, and they will provide further assistance. (https://support.apple.com/en-us/HT204084)
<How to request a refund>
1. Go to reportaproblem.apple.com.
2. Sign in with your Apple ID and password.
3. If you see the "Report" or "Report a Problem" button next to KineMaster, click it.
4. Follow the instructions on the page to choose the reason why you want a refund and submit your request.