A card on my file expired once (a few years ago) and instead of just making my account Silver and asking me to update my details if I wanted to, they decided to "Ban and delete" my account...
My account is now unbanned, and I see nothing has been deleted, but that is what the person on the phone told me, and it took him over a hour to get to that conclusion.
Stupidly after buying a new 360S (first one RROD) and taking up a 33% off offer on Gold I now have another card on file that I need to get removed but can't online because of the stupid auto renew feature.
Another lengthy hassle call to MS again soon it would seem