We do not have the ability to process refunds for iTunes Appstore transactions since purchases made are through the iOS payment platform.
If you have a Billing-related issue with your purchase, please contact iTunes Support by clicking here for further assistance.
To request a refund, you should see a "Report a Problem" link next to the item you purchased. If this was a recent transaction, the link/button might not be available yet. Please wait for the payment to post or for Apple to send an email of the receipt before requesting a refund.
App Store refunds typically take a day or two to process and you might get contacted by Apple Support to verify the reason for the request. For further assistance, you may contact Apple Support.
Google Play Refund:
Refunds on Google Play are handled by Google.
Please contact them directly here for further information.