Unable to download apps from the App Store
Help me complete my Apple Store purchase transaction
[Re-Titled by Moderator]
Did you get a message to contact iTunes Support? If so, follow the instructions below.
1. Click on this link --> Choose your country or region - Official Apple Support
2. Select your country
3. Select: Billing & Subscriptions
4. Select: Subscriptions & Purchases
5. Select: Update payment method
6. Select a chat session or a phone call.
Copied from iTunes support - Apple Community