HELP! How do I remove & cancel my credit card on my Xbox LIVE account management?

Hi! Damn how do I canel my credit card on my account management? Because I just find out Xbox LIVE they where charging me $7.99 a month %26amp; I just bought my 12 months of Xbox LIVE membership card. THANK YOU!!!|||well you cant do that. that is why alot o people buy the card from the shop|||soooo many people who used a credit cards have this problem next time you should just by the cards. ask to speak with a supervisor