Vehicle returned damaged and then charged for repair.

My car went in for a service on the 4/12/2017 for its 45 000km service. When handing the car in, the only problem was a broken 12V socket. Received it back on the 6/12/2017 with the service department ensuring me that the brake fluid was replaced and everything is in order. Once I drove my vehicle I realized that when I brake, the entire car starts shaking (This has never been a problem before). I returned the car to them today, 15/12/2017, and was informed by the service department that my brakes need to be replaced on my account. They informed me that even though my brake pads are still within normal, undamaged parameters, it needs to be replaced to stop the shaking, that only occurred after having my car serviced with them. The service cost me R2300, and now an additional charge of R2500 for the brakes. This is unacceptable. I will never buy from them or service my car with this branch again.