Look at the solution provided in the new customer support forums. Everyone that followed the advice there got this issue resolved.
http://answers.ea.com/t5/STAR-WARS-The-Old-Republic/i-am-subscribed-but-game-says-i-am-preferred/m-p/4926894#U4926894
http://answers.ea.com/t5/STAR-WARS-The-Old-Republic/i-have-subscription-but-it-still-says-im-preferred/m-p/4921486#U4921486