I had a similar thing recently. As I understand it, AWS uses a digital token for your added a credit card. Contact your card provider to renew/rotate/delete the digital token that is attached to your card. That should stop charges.
Doing that obviously might impact other services for which you use that card so you might need to re-add your card to those services.
Doing that obviously might impact other services for which you use that card so you might need to re-add your card to those services.