Hello and sorry you're having problems. It would seem as though your payment info may need to be updated on Amazon's site. This must be done through a computer- not from the Kindle itself. Please log onto www.amazon.com and follow the instructions below:
Manage Your Kindle Payment Settings
You can view or edit your 1-Click payment method by visiting the Settings page within Manage Your Content and Devices.
To view or edit your 1-Click payment method:
Go to Manage Your Content and Devices. From Settings, select Edit Payment Method below Digital Payment Settings. Select the desired credit card information, or add a new card, and then click Continue. Enter the desired billing address, and then click Continue. You will be taken back to the Digital Payment Settings page where you can view your edited 1-Click payment method.
If you need further assistance let me know. Please do not forget to click a POSITIVE RATING before you go- as it's how I am credited for my work. You can follow up at any time, at no additional cost.