if you have a frozen account that you need to do something on (such as transfer items/gold, or if you are trading/selling it to make the other guy think it has time on it or to meet the other guy ingame), then all you need to do is sign on to your account on the WoW website and sign up/get the 10 day WOTLK free trial. Then you have 10 days of account activation.
This is probably just stating the obvious but a few people might not have though of this . Also technically you are exploiting the 10 day free trial feature, but if this isnt considered an exploit let me know and ill delete this thread.