I have the same problem. I need a new code as the one i used hasnt linked to my psn account. Thanks to all the people exploiting it they have taken it down. Now those with real issues who have pre ordered the game cant use it legitimatly. I hope the sort it out soon.
We are aware that this form is currenlty down. We do not have a reason or time frame for when it will be back up. We ask that you continue to check the site regularly as we hope to have this solved soon. ^CT