Change or remove your payment information from your iTunes Store account (Apple ID) - https://support.apple.com/HT201266
Payment methods you can use in the iTunes Store, App Store, and iBooks Store - https://support.apple.com/HT202631 - debit cards are not accepted in all countries and even if they are accepted they may not be accepted for all types of purchases.
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