How did you check for the contents? Can you recall the email you used for redemption? I would suggest you try and login on this link using the same email you used to redeem the code: https://profile.callofduty.com/cod/profile
And then unlink then relink the right console account (PSN or Xbox). If it's not showing, there's a possibility that there is another console account saved on the CoD account you used to redeem the code.