Banks do not provide detailed information to Mapbox when credit card payments fail in order to protect your privacy. If your card information seems correct, it's recommended to contact your bank for more information or to allow payments to Mapbox.com. If payments are still being declined after contacting your bank, you could try adding a different credit card for the payment.
If you're working with your bank to resolve this issue, it's important to let Mapbox know to help prevent account deactivation and keep your account's Mapbox services live. You can contact Mapbox Support for this purpose.