Headlights Turn Off While Driving problems of the 2009 GMC Acadia

Passenger side low-beam headlight failed. Upon inspection, it appears the light socket itself has melted and caused the wiring shielding to melt as well. Attempted replacement of the bulb resulted in the socket housing crumbling in my hands. The dealer claims it will cost upward of $500 to change my lightbulb. This is outrageous and clearly the fault of GMC, who seem to have purposely designed these bulbs to overhead their housings, melt, and be almost impossible to change without taking the vehicle to the dealer. I want GMC to pay for new wiring and illumination.