Angry and Disappointed client

I have never been so angry and disappointed in my life. My husband and I bought an M135i and a 320i M Sport with 0km( basically new from the box). When the 320i reached 20000km it stopped in the middle of traffic and I had to be towed(the hazards would not work and I couldn't get the triangle from the boot, a dangerous situation because there were cars coming behind me). I was told it was the battery, I couldn't believe but I was told it happens so I let it go. At 40000km, the car started vibrating whenever i started it. I took it to the dealer they booked it a week later then I was told all 4 fuel injectors were damaged because of \bad"petrol from sasol. I told them that I did not feel comfortable driving the car anymore so Elvis and Danny told me they will make a plan. Their plan was to sell me an even more expensive car than than one. They saw I wasn't happy"