What service are you subscribed to? if only OneCare, ignore the messages as OneCare cannot be renewed anyway.
Do you have any subscriptions with Microsoft Billing/MSN/Windows Live/Xbox, Zune, etc?
If so, you need to sign in with the LiveID for the subscription account at
https://billing.microsoft.com
If you get the error message about no relationship, that means you are signing in with the incorrect LiveID.
The phone number would vary depending on the service you subscribe to. If you are an MSN Internet Access subscriber, sign in with your primary signin account at
http://support.msn.com
-steve
~ Microsoft MVP Windows Live ~ Windows Live OneCare| Live Mesh|MS Security Essentials Forums Moderator ~