Front Suspension Control Arm problems of the 2003 GMC Envoy

We purchased our 2003 GMC Envoy xl sle 8 cylinder brand new at alden Buick in fairhaven, mass in July 2003; for the past 3 years we had it serviced at robertsson's GMC 2680 cranberry highway, wareham, mass. 02571,508-291-0044. We had it reconditioned at this dealership last year, spending $4000. 00; we had it inspected at this dealership with the massachusetts vehicle check; it passed the front end check and frame check on 8/4/17. I was driving the vehicle in late December, and hit several deep potholes caused by an ice storm; shortly thereafter I lost steering control of the vehicle. I had it towed to alden Buick/GMC in fairhaven, mass. To be told that the entire frame had collapsed due to extensive corrosion and rust. I had it towed to robertson's GMC in wareham and filed a claim with commerce ins. Co. To hopefully cover the damage to the frame; commerce denied the claim stating"the frame assembly was severely rotted and this extensive rot allowed the right front control arm to break awayfrom the mounting point on the frame rail. GMC issued a technical service bulletin stating that some Envoy models suffered from extensive frame corrosion. Why did robertson's GMC pass the vehicle on the safety check, and why was I not informed of the vehicle's frame corrosion before I spent the $4000. 00 reconditioning it? why is frame check and front end check listed as pass on my vehicle when this corrosion and rust was present at time of insspection? fortunately neither I nor any of my family members were injured while driving/riding in this vehicle.

Tl - the contact owns a 2003 GMC Envoy. The contact stated that while inspecting the vehicle, he noticed that the right upper control arm was rusted and corroded. The vehicle was not taken to a dealer for a diagnostic. The manufacturer was made aware of the failure. The vehicle was not repaired. The approximate failure and current mileage was 56,000. Dr.