Ok so my visa card recently got screwed up and it can't be used on my itunes account. I can't delete the information anyway that I know of, and I can't purchase or update any apps because I need authorization, and to get authorization, I need to update the information as apparently there's a problem with the billing.
IOS 8.3 Iphone 5c
iPhone 5c, iOS 8.3
What do you mean 'need authorization' ?
If when trying to download something you are getting a message about a 'problem with a previous purchase' then that implies that iTunes wasn't able to collect the money for your last purchase and that therefore owe iTunes - in which case you won't get the 'none' option on the payment details screen (or be able to download anything) until what you owe is paid e.g. by replacing the card with another valid card, or by redeeming an iTunes gift card onto your account (if they are available in your country)
(I've asked for your post to be moved to the iTunes Store forum, where you've posted is for questions about the iTunes U app.)
How to delete my visa card from my account
