Badest service ever

We took our car for service with added service plan.well the ar was 100 % okay and only after collecting it from the dealer,it immediately started smoking right after arriving at our home.mind you the dealer was already closed As we fetched the car around 17:00.first thing in the morning I was on the phone with them regarding my issue.they then asked me to bring the car back to them only to find out that my car has caused turbo damage and guess what?I have to pay 130k for it to be fixed.my question is.why did the car occurred with problems right after collection.all my life I have trusted mercedes benz as my dad used their service for over 30 years.is this how the mercedes will deal with their unhappy customers with such poor service?