Go to account management, then billing information or something along those lines. You'll need to provide the password to your PSN account, but then you can delete the saved billing information from there (there's a button near the bottom). Hope this helps 👍
Thanks to both of you 👍 I usually do buy PSN cards, but I didnt want to go out and grab one to get this latest DLC so I just threw a VISA on there.. Thanks boys