I think I speak for everyone that we have all had our troubles with pet stores and their ignorance on the husbantry of reptiles. And you are right, the employees DO blow you off, especially if you are only 16 like me. On one particular occasion I went to a petstore in NY, and was shocked by the condition of the reptiles. A full grown male veiled was housed in a 20 gallon tall aquarium with a stick and some repti bark on the bottom. It had no uva uvb source, and the poor thing was extreamly dehydrated, let alone pissed. He was black, and was hissing at his reflection and at the kids who were jumping infront of him laughing. I could not stand to see such a noble creature humiliated and tortured like that. I first went to an employee and asked him how long the veiled had been there and why he was in a tank. The guy said he had been here for almost a year, no one would buy him, and that you were sappose to keep chameleons in glass tanks to keep them warm.
yeah...right...thats about the stupidest thing I have ever heard. It was pointless to try to tell the employee that that was wrong because wheh he had answered me he had that 'well for your information' attitude. So I went right to the manager, and rather forcfully told him that keeping reptiles in inappropriate cages like I had seen there was cruel, and if he did not fix the problem, that I would spread the word about his thoughts on animal care. And trust me, I would have. Everyone in the entire store was standing behind me on the issue because they had seen the veield also. After a few silent moments, the owner aggreed to move him into a reptarium and get him proper lighting, heating and water. Just to be sure, I stuck around and watched him take one of the 65 gallon reptariums off the shelf and some plastic plants and sticks. Then put it all together after he grabbed a few light fixtures and bulbs. And when he went to take out the veiled, the chamelon bite him, hard, like oww my hand is now bleeding hard. I tried not to laugh, and was satisfied after he was placed in his new cage and he sure was happy because he immediatly turned green, showing off as he perched on top of a plant. Now I was surprised that I had actually made a differance, and I would have bought the veiled but my mother would not have been happy if I came home with another creature... 
Sorry this is so long
Try to talk to the manager about it, suggesting that if they took proper care of their animals then they might have more happy customers and healthier animals. I don't know if it will help in you case, but be firm in you complaint, and let the manager know that you know what you are talking about, don't let him belittle you.
Hope this helps
Kaitlyn