Well, I guess we can't judge cars by their manufacturer after all.
I would get a second opinion if I were you then I'd keep fighting with whom you are fighting.
My mother was told that her 14 year old benz needed a new tranny, my mother didn't trust the guy - he was too pushy (and he offer to buy the car), she had it towed to the house and left it there to die. (long story) Sometime later she got a second opinion - a few parts and a several hundred dollars of labor later the car was back to normal, well

after she had to replace all the tires.
That car btw, is now 23 years old and has nearly 300k miles - original engine and tranny.