Why I cant pay for additional icloud space

Hi Sadanpartha,

It sounds like you're running into an issue upgrading your iCloud storage. If it's an issue with your payment method, you might need to contact either your bank or get in touch with Apple directly. However, we recommend double-checking this resource as a start If your payment method is declined in the App Store or iTunes Store.

"How to complete your purchase if a payment failed or was declined

1. On your iPhone or iPad, open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping.
4. Add a different payment method and remove the old one. 
5. Try to complete your purchase.

If you still can't make a purchase

• You might have an unpaid order. Learn how to pay an unpaid order.
• Contact your financial institution. 
  • You might need to ask your financial institution to allow international purchases on your debit or credit 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.
• In some countries and regions, your payment method might be declined because of changes to local law. Learn about billing and purchases in Europe or what to do if your card is declined in India."

If you cover all of the steps above and you're unable to complete the purchase, the next steps will depend on the error you're seeing. If your payment method is being declined, that's when you'd get in touch with your bank. However, if it shows you an alert that your purchase couldn't be completed and you need to contact Apple, use this link: Apple Support

Take care.