2013 Toyota 4Runner Body & Structure Problems

Rust appeared on the hatch of my 4Runner approximately 2 years after I purchased it new. My complaints to 2 different dealerships were ignored and left undocumented. I was told this wasn't covered under warranty. In 2019, the rust was finally documented by Toyota and I was told that this would have been covered under warranty, but now it's too late. At that point the rust was just an eyesore. Sometime in August 2021, while driving on a bumpy dirt road, my "open door" indicator illuminated and a warning chime went off. When I checked my doors, I discovered that the hatch wasn't fully secure. Upon closer inspection, I discovered that rust had eaten away the metal that secures the latch which keeps the hatch closed. The rust I had on the hatch, had eaten away at the metal from the inside, out. There is now only a small piece of rusted metal holding the locking mechanism in place that keeps the rear hatch secure. Since my earlier complaints to the service departments of Toyota went ignored, I contacted Toyota USA directly. I had explained that a cosmetic issue had now become a safety issue. Due to an apparent design flaw or lack of corrosion control, the supporting structure of the hatch lock had almost completely corroded away. This may be an isolated incident, however, other 4Runner owners may also be at risk and this needs to be addressed. No matter how old a vehicle is, the integrity of a vehicle interior should never be compromised by a locking mechanism rusting off, to the point a door, or hatch, can eventually open.Toyota USA dismissed my complaint. I stated that this is a potential vehicle safety issue, where occupants and vehicle contents are left unsecured and could be at risk. I was advised that this is just a matter of corrosion and that my warranty was expired, therefore, Toyota would not fix the problem.