If you went through a university, I hope you contact the program director. Not in a "oh bad people you" but maybe they just need to decline serving young kids. What if your child belonged to different parents who just accepted... and then their looking glass becomes this discolored portrait.
We did speak with the program director, who refunded our money, apologized and said she really didn't understand what had happened. In theory, they are all trained to test any child. We just had bad luck and a kid who was paralyzed by the one-way mirror. The tester stupidly told him "oh there are people back there watching you."
