I understand being aggravated at receiving broken product but... I don't find them not getting back to you in under 24 hours as anything more than you being impatient to be honest. If your emails are similar to your posts I can see why they responded the way they did.
I guess I see this thread and think.. you bought a cheap product for even cheaper it got damaged (doesn't matter where) and they are doing the right thing and replacing it. Moral of story buy quality products from quality businesses and you can expect things to be better.