I had a dealer not tighten the drain bolt on one of its free new car changes. That particular owner had recently purchased the Subaru dealership after owing a few other brands in the area. The owner had a reputation for paying little and taking shortcuts. We drove our vehicle to one an hour further away after that. That was before the current worker shortage. In today's job market who knows what kind of person they had doing it. The person from this, and other things they did, may be gone soon.
I had a reputable tire/mechanic shop break my windshield. I had them change the wiper blades and the impact break lined up perfectly with where the wiper arm would connect with the windshield if pushed back from its upright position. The owner asked if I would come into the shop. He had me come into his office, turned his monitor around to where I could see it, and played the video of the newbie mechanic doing it. He apologized, said the guy would be let go, and paid a glass company to come out and replace my windshield at my work.
Another time I picked up my vehicle from an oil change place that was right next to my work and gave the employees of my work a discount. They were locally owned and valued their reputation. It drove fine the 1 block from their parking lot to mine. Went I went home that night, after they were closed, the transmission felt terrible. Turns out their low dollar new employee took the CVT level plug off and topped it off with ATF, even though the transmission was not part of the job asked for or paid for. That was a nightmare, but eventually, I got a brand new CVT installed by the dealer paid for by the oil change place. They fired the employee and I used them a few more times before I decided, with the proper inexpensive setup I would rather change my oil, CVT fluid, struts, sparkplugs, change airfilters, clean mass airflow sensor, PVC valve, brake pad and rotors, brake fluid, and more myself. With the help of Youtube and things like a battery impact driver, it is amazing what I have been able to do.
Any dealer could have a bad a person on staff who did this to your vehicle, to me the question are they truly sorry, and will they take measures to try and prevent it from happening again? Put the pressure on them to convince you if you are willing to stay with them!