Payment Method Not Accepted
I tried adding a payment method in Settings so that I can make purchase on App Store and it said that it could not verify the card and asked to contact Apple Support. The card details are definitely correct though.
Since it says to contact iTunes Support, try this:
1. Click on this link --> https://support.apple.com/choose-country-region/media-services
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.