How do I cancel my credit card on my xbox live account?

I tried to cancel my credit card on my xbox live account online and it said it could not do that at this time I want it to stop auto renewing the xbox live pleeeasee help!|||You can just call xbox and have them shut off the auto renew. It wont let you delete the card if it's the only on on it.|||you better call them. go to xboxlive.com and find a phone number before they renew your subscription.