Bah, I just bought The Signal DLC because clicking it on the Alan Wake game makes you buy it, when in every other game it brings you to another page where you have the option of putting in the redeem code. 
 
This is so infuriating because I doubt Microsoft will offer me any kind of help! 
 
So I'm stuck with an unused DLC code, if anyone wants it, just PM.

against the rules to sell things on these forums bro. Sorry about your loss though.

Thanks for letting me know, i'll edit my post.

"Buy Now" link buys stuff.  Just sayin' 
 
Actually, that really is a bummer, sorry to hear that. Make sure you watch carefully for these sorts of things, look before you leap.  I believe there was a "Redeem Code" button right below the "Buy" button.  

In the Alan Wake game it was, Click on the DLC about the signal and then download which made me automatically buy it, I was expecting the Pay with Points or Redeem Code page. 
 
Got in touch with Microsoft and explained the problem, there advice was "perhaps you can sell the code to a friend?" 
 
Them not redeeming it was annoying enough, but that suggestion really seemed to rub me the wrong way.

I had the same problem! I inserted the redeem Code before the expansion was available, live accepted it, and in the next day, say bye bye to 560 points. I just felt like spending the next points available on crap and never add points again.

That's pretty shitty.

" @JayDarco: Sometimes i forgot to view my hotmail account (damn gmail!), and there was the code to download the DLC... The microsoft  logic is... you have a coupon with a code that will originate another code that will be delivered in your email.... My logic was... ok... i have a redeem code, just use it in the xbl , the download screen should appear next.... but i guess it's very hard to microsoft to implement that... "