You made a fundamental mistake by accepting the board when it was delivered to you. This is not a hidden defect but a one that can be clearly seen. If you accepted the delivery, it means that you accepted the white color at the bottom.
Furthermore, sure you would find somewhere in Starboard website and catalog a sentence like "Starboard reserves the right to change the specs without prior notice..."
But of course, your dealer should have replied to you (not Starboard, it is with the dealer
that you are in buisiness) and make a commercial act on your next order (little discount...)