It's far from an attack on you, but everyone would like to get a clear idea of what happened. You put all of the info on the table and people express their opinions. Your experience only validates that buying a bearded dragon from retailer comes with risks. It sounds like they were fair in handling the situation. Frankly, you could put a Good Guy post about them that reads, "They sent me a sick animal, and agreed to pay shipping for the return of the animal and/or send a new one if it didn't survive." That's above and beyond what most business like there's will do. Usually the return shipping is on the customer regardless of satisfaction. Even when I read the emails they seem very professional.
It does suck that you didn't get what you expected, but I'm glad you didn't get screwed out of money or treated poorly by them.
Are the pictures supposed to be proof that it's sick?
I don't want to continue to make it seem like an attack, but I would really like to know how you got two 100w ceramics, a 100w basking light and a UVB lamp all on a 20gal cage? Not only does that seem excessive, it seems impossible.