I've experienced the same situation. I still got one stay plus left from previous calendar. Since my account was downgraded from Platinum to basic (the lowest Accor Plus level supposed to be Silver, don't have any ideas why...neither Accor +) for a month so I didn't use it. Then, when I renewed the Accor +, my stay plus stays ZERO (supposed to be 2+1) eventhough my membership was reinstated to Platinum, I emailed them asking why stay plus was missing, but no reply at all...However, in 4 days; all my stay plus were reinstated to 3 nights. Just emailed them then they will know how many stay plus that you have used.