Bad service

I am very disappointed with hyundai Bedfordview.I took my hyundai II20 there February 2015 as the engen light was on,but I was told there's nothing wrong with the car, 3 days after the car broke down and I was told it had hit the top because of the damaged water pipes, and I was never told about that when I took the car to them, and I had to take my car back because the warranty policy(innovation group)refused to pay .and after getting a mechanic I was shocked because some parts were missing from the car. I'm so disappointed and I'm out of words