I can't add my new bank card, how can I fix it?

If you can't add a payment method, check https://support.apple.com/118429 , or this one about what to do if your payment method is declined in the App Store or iTunes Store —> https://support.apple.com/108095

- Based on the information you enter, Apple is checking with your financial institution if the payment method is valid. Apple is receiving a negative, or no, response. Make sure the name and address are entered exactly as it appears on your financial institution bills and that the 3 digit CVV is correct. Check with your financial institution about the status of your card. “If you want to know why a debit card, credit card, or other payment method was declined, speak with your financial institution. Apple doesn't have information about why the payment method was declined.”

Contact official Apple Support. Click here --> https://support.apple.com/choose-country-region/ Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.

or:

See a list of Apple phone numbers around the world, in this article --> https://support.apple.com/HT201232

If you're in India, click on this link to read an April 2022 notice 'About billing for Apple subscriptions and media products in India' --> https://support.apple.com/HT212781

Additional verification that may be required when making purchases in Europe or Japan --> https://support.apple.com/108103

What did Apple support say when you contacted them as directed?