unable to update/download apps and bank card being decline

My app store had been working fine until yesterday, when I had to delete and app because it had frozen. when I tried to reinstall it, it would ask me to sign in and when I would it would decline my bank card because of my info, so I re wrote my bank details and still says the same thing! it is very annoying as I cant even update or download anything without my card being declined! :/

Please can anyone help????