Business ProfileforAudi San Diego

I'm filing a complaint about the quality of service and maintenance on two 'certified used' Audi A3's vehicle(s) I purchased from Audi San Diego. I purchased my original 'certified used', 2016 Audi A3 from Audi San Diego on 2/10/2019. During my ownership of this vehicle, I had a history of inadequate service by Audi San Diego that led (I feel), to a premature failure of the engine at 56K miles on 9/29/20. (See attached invoice #1). Prior to this date I had brought to the attention of the service advisor that the **** light" was coming on periodically during times of acceleration of the car. On 9/7/19 I first informed the service advisor about the *** light, as well as the BRAKE LIGHTS STAYING ON, immediately after having a "multi-point" inspection of the vehicle on 9/6/19 at 35Kmiles (See attached invoice #2-3). I noticed the brake light issue on my drive home from Audi San Diego after picking the vehicle up from the service center on 9/6/19. On the trip home I had several vehicles nearly rear-end my vehicle since the brake lights staying on permanently on, regardless of whether or not the brake petal was pressed. There was no issue with the brake lights prior to the 35K service inspection. I brought the vehicle back the very next day, and I was initially told that my aftermarket dashcam I had installed on the vehicle was interfering with the brake light electronics. Given the fact that I'm an Electrical Engineer, (MS in EE), and I have many years of experience with basic car repair, I found this statement very hard to believe. Ultimately it was discovered that the connector to the brake light switch, (located in the driver's side footwell), had "somehow" came disconnected and was the source of the faulty brake lights. (See invoice #2). I mentioned to the service manager that this was a very dangerous situation and a "gross oversight" in the vehicle inspection that was performed on 9/16/19, considering a multi-point inspection was done on this date.