I renewed my 12 month gold subscription in Jan 2012 with a prepaid code.
I did this through a dashboard offer to receive 600 points for renewing my subscription.
I received an email confirming the renewal on 06/01/2012
The next email I received was from Xbox LIVE Rewards saying that "Your Xbox LIVE Rewards Membership is Now Active" dated 28/02/2012
I have not received the points or had any email communication to acknowledge that they will be credited.
Thanks for any advice/help.