2017 Alfa Romeo Giulia electrical system problems

The brake by wire system failed, and another component caused the vehicle to accelerate when I hit the brake pedal. I didn't have any proof on the last complaint, but I have it now. This brake failure caused me to rear end someone, which caused a multiple vehicle accident. The dealership I took it to was aware that I was having electrical issues with the car, but they said they couldn't do anything about it because they couldn't find any fault codes. I even sent them a video of it as well.

I purchased this vehicle at the end of may 2017, after putting on about 500 mi within 4 weeks, a check engine light came on, I took it to the dealership, they kept it overnight,looked at it, and called the following day & said there was "something loose that needed to be tightened" and that the car was ready for pick up. I drove the car and parked it in my garage.