My 2013 Silverado doors fall apart

My 2013 Silverado doors fall apart. I have replaced the window switch in left door two times , both handles/armrest have come apart with only normal use and you will not sell the parts to repair them but you will sell the entire door panel for over $600.0 dollars , very poor engineering . Create a fix for this door problem that is reasonable . We the public have chosen chevy as the truck of choice for a longtime {make it right}