Yes, please get some pictures up as soon as earthly possible, since Pacus are more trouble than most people can deal with. They're great-looking fish, but they get HUGE, and they'll bite through anything they can fit their mouth on.
And if they ARE pacus, you can still take them back and get the RIGHT fish, or store credit and they can order in the right one for you.
I should've warned you before. Just in case the eye is a concern for you (with the RBP pic) My red belly's eye is deformed on that side. Their eyes just look more "predator" than a pacu's.