How do I delete a debit card that I put in Apple Cash that had the wrong info on it

Set up and use Apple Cash on iPhone (U.S. only) shows you a few actions you can employ. The Card Details option shown below should be what you need.

Scroll down the page to:

Manage your Apple Cash

Tap the Apple Cash card, tap , then tap any of the following:

• Add Money: Add funds from a debit card in Wallet.
• Transfer to Bank: See the Apple Support article Transfer money in Apple Cash to your bank account or debit card.
• Card Number: View the last four digits of the Device Account Number—the number transmitted to the merchant.
• Card Details: Update your bank account information, turn Express Transit on or off, manage Apple Cash Family, and more.