Took my BMW for a service, it was explained to me ...

Took my BMW for a service, it was explained to me that the brakes was still fine but they replaced it for me anyway. A week later I had a vibration on the steering wheel, took it back on a friday and received it back the same day, thet explained that they had to replace some brackets and the problem was sorted. A week later the vibration was back. Im to scared to take my car back to them, and hace to take a day of from work to go to a dealer near my home 40km from work. And this is my only mode of transport. BAD BAD BAD