2015 Subaru Forester Seats Problems

I purchased a certified preowned 2015 forester in november from northtown subaru in amherst, ny in november 2017. I was sold a basic model and assured that the remote car starter and heated seat that they could install at the dealership were as good as the ones included in more expensive forester models.

While driving down the highway the seatback emitted a loud "bang" sound. It then lost all support and structure, forcing me to drive my vehicle while attempting to maintain an upright position. At the time of the failure I was not adjusting any element of the seatback -- I'm one of those people who set it once when I bought the car and hasn't touched the adjustments since then.