At 8" the fish is too young for it to have the colors you're expecting. RTGs are native to Sumatra, a standard RTG will have gold scales up to the 4th level, maybe 5th on occasion. High backs will go to the 6th level. I don't think you were ripped off. The fish shows a lot of potential, give it time and let it grow. You most likely have about another year before it reaches 15".