Well, you can try talking to them. I can't definitively say from experience that they won't, but i've never heard of them doing it. But since i've never heard of WoW doing it either, take it for what its worth. It shouldn't take a week to get a response (but you won't get one on the weekend).

So why exactly are you cancelling anyway. unless that's not your highest level class, you haven't even gotten to the best parts yet.