All transactions completed on iPhone, iPad and iPod touch are handled directly by Apple. Please contact Apple Support via the following link if you wish to request a refund: https://support.apple.com/contact
If the purchase was made via Google Play, then we can indeed assist, but please keep in mind that we will only refund a purchase within 7 days of the transaction. If this request is outside that 7 day period, then we cannot refund you.
If you purchase was made within the 7 day period, please send us a message via the 'Contact Us' button on the main support page with your Purchase Order Number (the order number usually start with "GPA").