I’m truly sorry you were disappointed as your expectations were not met. Yes, it was different in the past before Oceania introduced Grand Voyages. It’s not longer possible to separate reservations for the cruises combined in the GV. On the other hand, most likely you were booked on the cruise that normally would be cheaper than the combination of two separate cruises of the same itinerary. You need to look at the numbers - possibly you weren’t missing that much in the value of that cruise. And if nothing changes you will be able to get your Silver benefits when you book your next voyage with Oceania.