Consumer Redressal

I own a Chevrolet Beat LS Petrol variant with registration number AP28BP4964. I serviced my car on 21st January, 2015 from Aravali service center, Mehruli Road, Gurgaon. My battery needed to be replaced, and I also requested for a general service. Car was delivered to me in the evening 6 o clock, Later at 10 pm, when I was driving home from office, near Rajiv Chowk, I realized that the car break is not functional. They took the car to service center @ around 2.30 am (22nd January). I received the car @ 2 pm on that. Next day morning, while starting from home to office, I realized that the break is not working again. They took the car again to service center. Later in the evening they told me that they replaced something and it costs 5300. I needed the car badly; hence paid the amount and collected it. l have 2 concerns here. 1: This issue with break appeared after first servicing. Break was functioning perfectly fine when I gave it for service first time.