Unhappy with technician service on car

In November 2014 my car bmw 320i went for a service, there after in January 2015 there was a problem with the fuel pump. 4th March 2015 the car went in for a service again and on the 16th of March 2015 the fan belt was loose and oil was all over the engine, that cost me money again. Since November 2014 to date my car cost me a lot. I just want to know does BMW service the cars and break other part in order for the customer to spend more money. This is unacceptable and I will not buy a BMW ever again. I feel like trading my car in.