Car challenge with Ford

I bought a brand new Ford ecosport at Ford Pretoria central in 2019. Since I bought it, it gives me challenges. A light spanner and light engin keeps on coming to the screen then the car will loose power and fail to brake. And it may cause an accident and it give a terrible sound. When I return it they keep on changing parts, but after a week or so it will start again. They did promise they it won't do again. Bit it keeps on doing again. I'm no more enjoying the car, I'm even afraid to travel far. Pls hel