You have posted in a voluntary, user-based, technical support community - it is very unlikely Apple will respond to, or even read, your post here, only other users like yourself.
If your payment method is declined, or you have a billing issue with a previous purchase in the iTunes Store - https://support.apple.com/HT203005 - additional information: https://discussions.apple.com/message/31245423#message31245423
Payment methods that you can use in the iTunes Store, App Store, and iBooks Store - https://support.apple.com/HT202631
iTunes [Store] Support - Use this form for assistance with account and billing, code redemption, or purchase questions - https://ssl.apple.com/emea/support/itunes/contact.html
View, change, or cancel your subscriptions - https://support.apple.com/HT202039 - "Learn how to view your subscriptions that renew automatically, change your subscription period, and turn off Automatic Renewal." "If you don’t cancel more than 24 hours before your renewal date, your subscription might renew."