After looking at the threads regarding this error code, it asks that if your having problems with this to start your own thread and answer these questions below. So here I go as the phone service is useless and have failed to do anything.
If i was you, i would physically ring Support, and get them to check your purchase history, and then check to actually see if you did download it. Once they confirm what you are saying is true, they will refund the points if it was an error. I doubt anyone here will be able to resolve this. Good luck, and let us know how it goes.
"I don't celebrate because it is my job. When a postman delivers his letters, does he celebrate?" - Mario Balotelli
I am sorry to hear about the trouble you are having.
This is a link to the Call of Duty ELITE support chat. (where you chat with a live representative of Elite)
You may need to sign in to chat with them, and I am pretty sure you don't have to be premium to chat with them. Give it a try either way. To chat with a live rep, look on the middle right of the page it will say 'Chat Now', you will then be connected with them, then just explain your problem.