After looking at that hive, I am appalled that anyone could be so derelict in their husbandry and complain about anything. A couple of decades back, I would have given that guy a piece of my mind and more if he so desired.
I agree with Iddee, give them free advice and council, but your warranty expires when your tail lights are no longer visible.
I wish I had the hive that Yankee11 showed in his picture. If I lived close to that guy, I would give him his money back and take the hive.
I have found most people to be honest, and it seems to me that my fellow beekeepers are more honest and giving of their time and resources than any other group of folks that I have been associated with. This client is one of those spoiled people that think that nothing is their fault. He has what I call the "victim mentality."
Anyway, I'm done with this thread, but it has been an interesting one, and I have learned from it.