Dealership refused to admit to a mistake, basicall...

Dealership refused to admit to a mistake, basically saying the customer is lying. So now customer is liable to pay for repairs and says that customer should be thankful Lexus Canada is paying a portion of problem, which is a manufacture defect as told directly to me by Lexus authorized mechanic. But, if the vehicle wasn't poorly put together and made to begin with, this problem wouldn't have been existed...which mean there wouldn't be repair costs...neither for Lexus Canada or the customer would've had to pay. What on earth..?? What games are you playing Lexus....