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This is usually an issue with the Firmware, so I would first like you to do this please.
Remove the charger from the Kindle and hold the power button to off for 35 seconds.
Release, then connect the charger and try to turn on the Kindle and purchase a book.
Let me know the results please
No, I want you to do the following please.
Visit the page for your account on your computer - https://www.amazon.com/manageyourkindle
Log into using your Amazon account (the same Amazon account you have registered on your Kindle)
On the right side select "Settings"
Under 'Kindle Payment Settings' (first option)
Click 'Edit Payment Method'
Change your credit card details.
Restart your Kindle and it will update
then try to purchase.
Ok, it looks to be the firmware on the Kindle, which model Kindle do you have?
you need to do this on the Kindle itself by registering it, you did not tell me the model but to do this you either
For most other Kindles
And register it to the correct account