I also requested new luggage tags end of December as the old ones broke and got lost. Still haven't had them. Maybe you should give SAS a call?

You stay at a membership level until the end of your next qualification period. If you don't re-qualify, you'll lose the status. There's usually a small 'grace period' as well at then end of it. In your case you'll stay silver until at least 28 February 2016, and if you manage to get enough points before then to re-qualify, you'll keep it one more year.