Hi there,
I am in the process of seeking further information concerning this error. Today I spent over 4hours with a customer service agent taking photographic information and proof that I have a code that has already been redeemed by someone other than myself.
I attempted to use my code on PSN only to be informed that the code has already been redeemed. I contacted Sony, who confirmed it was used on Tuesday at 01:32 by a user in Germany. Well unfortuantly for Activision I have proof that my sealed hardened edition arrived by signed delivery at 11:00 the following day, as such, they must have provided duplicate codes.
My case has been forwarded to someone more senior and was told to expect a reply within 24hrs (I'm not entirely convinced this will occur but here is to wishful thinking). However if I have any information I'll pass it along.
To answer your question, it's unlikely you'll get a full refund, but do send Activison an e-mail using the support link at the top of the page. Send them as much information as possible, where it was brought, when, did you pre-order?, the BLES code of the game (found on the back of the game manual). All of this might help track down what has happened.
The agent sounded quite confident that somethign would be done to resolve the issue and award me a new code, but as I said, I'll be posting either my findings here, or on Watchdog and the BBB.