Can’t buy more iCloud data
can’t backup my phone due to full iCloud. Trying to buy more storage and can’t. Pending wrong charge in my Bank of America and can’t cancel or remove the card
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You can also pay for iCloud Storage by using Apple Gift Cards, until your credit card is working again:
What you can buy with your Apple Gift Card or Apple Account balance - Apple Support
How to redeem your Apple Gift Card or App Store & iTunes gift card - Apple Support
After you have added Apple ID balance as your payment method, you can add another payment method or remove your existing credit card info.
If you need to change or update your Apple ID payment method - Apple Support