Unable to Authorize DLC - Only just bought the game.

I bought this game a few days ago on disc. It installed without a hitch but it won't let me access any of the DLC. The error message is as follows;

Unable to authorize the listed DLC.

Please log into the alliance network with the account used to purchase the DLC.

ME3: Content Patch DLC Module

Multiplayer Expansion Pack 4

Mass Effect 3: Earth

Rebellion Pack

Resurgence Multiplayer Expansion

Mass Effect 3: Extended Cut

I've tried repairing the install several times, and even uninstalled and re installed, to no avail.

Any help would be gladly appreciated.