Request is not refund it why?

As far as my knowledge goes that all sales on the App Store are final. However, Apple may consider issuing a refund or credit in certain circumstances, such as:

1. If the app is fundamentally broken, crashes frequently, or fails to perform its stated functions, you may be eligible for a refund.
2. If you paid for an app but never received it or couldn't download it, you might be eligible for a refund.
3. App Purchase
   1. Curious about a Charge? --> If you see an 'itunes.com/bill' or an unfamiliar charge on your statement
   2. If you have an issue with an app on App Store or billing --> Request a refund for an App Store or iTunes Store
4. Subscriptions
   1. You may view a subscription to an app --> See or cancel your subscriptions - Apple Support
   2. You can also request a refund for a recent renewal of an in-app subscription purchase 

Avoid accidental purchases

1. If it is your device then, please --> Use Guided Access with iPhone, iPad, and iPod touch - Apple ... before handing over a device to a child.
2. If it is your child's device then in the future, enable the Ask to Buy feature --> Request and make purchases with Ask to Buy - Apple Support

This is a user-to-user public forum.

Apple Support Community Forum

This is Apple Support Community forum, for user-to-user interaction for information & idea sharing between users, if need be, extend support on technical know-how in handling Apple products from more experienced fellow users, This is not the right forum to discuss with Apple Inc.