Can't add a card to my account

Everytime I enter it in, it says check your info it doesnt match the info on the card. After a few tries it says it can't authorize and I need to call my bank. I've called and the bank told me there wasn't anything on their end that was blocking me and
to contact the merchant. I've tried calling support and following the website links and every single source has given me instructions on how to change payment method but not addressing my issue.

:)