2022 Porsche Macan

I was driving the car and warning light “possible R gear fault-driving permitted” came on. While driving on a highway at 50 mph, gear shift started malfunctioning and oscillating between 2nd and 4th gears and I could not change the gears. I lost control of the car speed and it would drop to 25-30mph even if I stepped on the gas pedal. It felt like the car would come to a complete standstill on a highway with other cars driving around me at 50-60+ mph. I had my car towed to Porsche dealership. They spent 2 weeks at the dealership and said that they have replaced a transmission valve body. They told me to take the car back. Based on suddenly losing the control of the car speed on a highway, I did not feel safe to put the car back on the road. Porsche company offered money to cover rental car cost but refused to repurchase the car and provide me with another lease car. Although they were not sure whether this incident could recur and I told them that, for the safety of myself and other drivers, this car should not be placed back on the road. There are several Porsche owner forums which reported multiple identical incidents but both dealership and Porsche company were ignoring the owners’ concerns and putting the problem under a rug. This is a serious manufacturer defect and Porsche cars are known to have these transmission issues but no recall has been made to address such significant safety issues that may cause multi-vehicle accidents. They are also refusing to issue a statement that they would be fully liable if a similar transmission failure recurs and results in accidents that could potentially endanger the drivers involved. I would be happy to provide the car for inspection.