Call back and say you want to upgrade your room. THe agent might have thought you wanted the lower price on your current room, which you can't do after final payment.
This makes no sense. Because you don't have those extras baked into your cruise fare making it more expensive and don't want to pay for them separately, this rules out an appealing itinerary?
Yes, they want to remove dining that can accommodate the entire ship and force you to eat in restaurants that can accommodate about 1/5th of the ship. Makes total sense.