If you feel that you were charged incorrectly, you will need to contact Apple iTunes or the Google Play Store and have them credit your account. We do not handle the accounting of personal accounts, that is all done through either of the app stores.
For Apple (iOS) devices:
Visit Apple support and follow the steps included on their page.
For Google (Android) devices:
Visit Google support and use the ‘Contact Us’ button to reach their Customer Support.