Owners/service Manual problems of the 2013 Cadillac ATS

Transmission issues. Rattling under the chassis that sounds like someone grabs the drive shaft and shakes it when the clutch is pushed at slow speeds ie moving up at a stop sign, in traffic etc. Defective dual mass flywheel was found after the service department told me my claims were up to factory standards. After taking apart the transmission (at less that 10k miles) gears 1-4 were found to be defective as well. The vehicle still has shifting issues and a loud rattle. I road tested a 2015 manual Ats and it drove smooth with no rattles. I was told the 2015 would drive the same once it hit 10k miles like mine which is a ridiculous statement. Vehicle has also shut off while in traffic, and upon restarting the vehicle I no longer had an power steering. I do not feel safe in this vehicle for myself or my children. There are many reports of issues with the 2013-2014 manual Ats and records of gm buy backs. The service manager agrees there is an issue with the vehicle and recommended I call gm to initiate a buy back. But the service department insists this is factory standard and refuses to address the issues.