2020 Mini Cooper S Engine problems

I was pulling into a parking spot slowly and all of the sudden the car took off and took off and I couldn't stop and when I tried to sped hard on the break it wouldn't work and I lost control and my car wouldn't stop until it crashed into another vehicle that was sitting in another parking spot.

During a rain shower, drove at about 15mph into roughly 4" of water gathered on the shoulder of an access road adjacent to the highway and the engine stalled. Would not restart. Puddle of water was not high enough to breach the cabin - running boards were still above water and the curb adjacent to the street was not submerged. Car would not start and transmission locked up. Bmw roadside assistance contacted and advised not to start; tow truck had difficulty loading onto the flatbed because the electrical system had malfunctioned in the electric convertible top and was overriding the ability to put the car into neutral. *Tr