How remove my card bank app iPhone ?

If you have a subscription, you are required to have a payment method on file.

See the Apple Support article(s) below. Link to contact Apple Support is at the end of the article.

Apple ID - If you can't remove your last payment method or use no payment method with your Apple ID  

See -> Change, add or remove Apple ID payment methods

Change, add or remove Apple ID payment methods – Apple Support (UK)

• Add first the new card, then remove the old one.

👉 If you're still unable to update your payment method, Contact Apple Support.