Just had a cool chat with xbox live support. I wanted to remove my Credit Card from the account (which had expired any ways - but we all know this doesn't stop MS). As I keep hearing about accounts being hacked and so forth. So I phoned them up. Spoke to this decent Irish guy who I explained the issue too, that it is too easy to buy stuff internally and that I like to get all my stuff externally using redeem codes and such.
he said you account is due to expire next year... But you're using 1 month codes, why is that? I said there was an offer on xbox live and he burst out laughing. Said you "stacked the account right" - I said yup and he said one second... spoke to his colleague and said he can't remove it due to these but he'll make the account silver, send out codes via email.
Codes came 2 minutes later, 13 months worth. So in essence, I turned off auto renewal, removed my card and got the 1 month xbox live codes for £1 changed into legit codes.
A good 10 minute call!