I cannot update my account

Hello ~ To add your new card if you haven’t been able to …take a look here…

Change, add, or remove Apple ID payment methods

Add your new card first the remove the old one. Have you activated your new card? To buy more iCloud storage …

Upgrade to iCloud+ - Apple Support

~Katana-San~

Hello ~ Can you explain in more detail? Which form are you trying to complain? Any pertinent information will help us to provide some assistance. Exact message perhaps.

~Katana-San~