Subaru of South Hills

I purchased a used 2011 Mercedes-Benz from Subaru of South Hills on January 7. After 8 months of use, my auto shop notified me that the entire rear subframe of the vehicle, including the brake lines, is rusted through. The shop won't do repairs on the vehicle because they believe it will be unsafe to drive regardless of any repairs. I have pictures and the mechanic's write-up dictating the extent of the rotting. There is no conceivable way this extensive rotting came from the past 8 months, especially since the vehicle has been used primarily in the spring and summer, where it encountered little to no road salt or snow.

When I contacted SoSH, they notified me that I signed an "As-Is" form at the time of purchase and, as such, they refuse to do anything about it, with their response essentially amounting to "sorry you didn't think we'd sell a car in this horrible of a condition." I was not made aware of significant damage to the frame of the vehicle at the time of purchase, and I believe they acted unethically in not conveying this information. Additionally, the vehicle was advertised as having Bluetooth compatibility for music and a functioning AC--neither of those statements was accurate. I would have still purchased another vehicle from them at the time because the on-site customer service was great.

So, I'm stuck paying $300 monthly for 5 years for a vehicle that never operated as advertised and is now completely useless. No one will work on it because it is an active safety hazard. I don't want a refund for the vehicle. I'm not asking them to pay for repairs; this vehicle likely won't be safe regardless. But, at minimum, an offer for a fair trade-in (i.e., one that accounts for their role in not advertising the true state of the vehicle on multiple fronts) would be acceptable and represent their dedication to ethical business practices.