Unfortunately, only Apple can process refunds and payments. We don’t have access to your credit card information.
You can contact iTunes Customer Support directly at https://getsupport.apple.com/.
When you get to this page, click Billing & Subscriptions followed by Subscriptions & Purchases. Once here, you'll be given a variety of options through which you can contact Apple.
Direct link to requesting a refund: http://reportaproblem.apple.com/