"We've reviewed your request and your purchase does not meet the conditions for a refund."
Refunds are not guaranteed. For more information, see the Terms & Conditions.
If Apple has notified you that it is not eligible then so be it.
We can't help you, sorry, we are also users of Apple products & services like you.
To avoid such a case in the future, see the following Apple articles:
Require a password for App Store and iTunes purchases
Require a password for App Store and iTunes purchases - Apple Support
Manage App Store purchases, subscriptions, settings, and restrictions on iPhone
Manage App Store purchases, subscriptions, settings, and restrictions on iPhone – Apple Support (UK)
Prevent in-app purchases from the App Store
Prevent in-app purchases from the App Store – Apple Support (UK)