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the only way is to call Xbox's help line. Just as a warning though, Cancel your account means delete it, just tell them that you want to downgrade to a silver account at the time of the next payment instead of recurring payment.
they will try almost ANYTHING to keep you on though, so be ready.
Google it first please :D
IMPROVEMENT:
If you have a PC, you can remove your credit card information yourself. First, get Microsoft Live Games for PC. Then, download Tinker (a Free for PC game for the Live network). When installing the game, make sure you use the same account you used for your XBox 360 to activate Tinker.
Now, go to your account settings. You can change or even delete your credit card information there. It will not affect any of you XBox Live settings, or Xbox 360 Gold subscription, it only removes you credit card information.
What else can I help you with?
How can you remove card details from an Xbox 360 account?
you have to call 1800 my xbox
Remove your daughter from your credit cards?
Call the credit card companies and tell them that you want her removed as an authorized user from your card.
How can you setup an xbox live account without a credit card?
All you have to do is create the account and it automatically becomes what is call an Xbox Live Silver Account. You don't need any credit card or subscription card.
How do you fix your credit card on Xbox Live when it says credit card not authorized?
that's what u get for using a super cool xbox
Do you have to have a card to join Xbox live?
U can use a credit card or buy a Xbox live membership card
How do you cancel a credit card out of Xbox live someone help me please I really want to play Xbox again?
i believe you have one of two options: 1. create a new xbox live gamertag 2. call support and update the information onyour account to correspond with the new credit card.
How can I stop receiving credit card services calls?
You can stop receiving credit card services calls by registering your phone number on the National Do Not Call Registry and by asking the companies calling you to remove your number from their call lists.
Who should you call if a credit card company listed you as deceased on your credit report?
You should call the credit card company.
How do you stop a child from buying games on a Xbox live?
Go to Xbox.com or call 1-800-4MY-XBOX and take your credit card information off the xbox or just take the xbox's power chord away and ground him or her
Why doesn't my credit card work for xbox live?
Maybe your credit card isnt compatible with Xbox live? Check all information to see if you inputted the correct information,
How can you make the credit card company reopen an account and remove 'closed by credit grantor' from your credit report?
You can't MAKE a credit card company reopen an account. You can call the credit bureau and request that they change the status to indicate that is was closed by you and not the credit grantor. Or, you can simply put a notation in your credit report stating that the account was closed by you and not the card company.
How remove false charge from credit card?
How do I remove false chages from my debit card?
