general problems of the 2003 Toyota Sequoia

3/22/17, driving om I 85 highway from greenville, s. C. To GA. . Smelled something burning, turned off my air and radio. Seat began to heat up. 45 minutes to go. Parked did not get back into the car until 4/3/2007. Noticed side of seat covered in smoke and seat adjusters melted and blackened. Unable to adjust seats. Took car back to greenville to dealer week of April 10th. Told I had to report this to corporate. I called corporate and they asked me to send pictures, I did, corporate sent inspector out on may 15th, 2017. Promised a response in 30 days. This is my only vehicle, I was fearful, but I continued to drive it. I waited on a response, and made several phone calls, and was told pictures were sent to china, and it would take more time. I continued to call corporate and in August I finally received information telling me that I had caused the problem and Toyota would not fix my car. I have had the SUV serviced as directed by the manuel by a Toyota dealer since I purchased it in 2003. I did nothing to cause this malfunction in my power position control system. I informed corporate several times that this was aggravating my already injured back because I could not adjust my seat. I am now scheduled for back surgery next month. This malfunction could happen to someone else and I am fearful of my what could have happened to me and what could happen to someone else. I had about 223601 miles on the car at the time of the incident. Please investigate.