I don't know.. The way I see it is like, you have a son and to protect him while playing skateboard, you bought him a couple of low quality knee-pads and all to keep him safe. But when he fell, the knee-pad somehow made some bruises on your son's knees. Instead of putting the fault on the knee-pad that cause the injury, you blame your son for having a low-quality skin... Just the way I see it though.
I've had an experience of protection case ruining my phone. I used my N97 mini without a protection case for a year and I didn't have any problem and not a single scratch at all. But then, I decided to protect it and bought a cheap MYR10 cover to protect the back. A week later, I took it off and found the cover had scratched the edge and the back of my phone! So, after that I decided to let the device free without any casing whatsoever. Until today, I didn't register any new scratches to it. I didn't blame Nokia for having a not-so-good quality phone, but I blame the cover for not being a good quality product and ruined my phone. Yes, also my mistake for buying a cheap cover...
Anyway, I feel sorry about your phone though. I know how it feels like to have that kind of thing happened, even if it is small enough for some. Just live with it because to me, these small scratches and all kind sort of adds a character to the phone.