Hyundai Motor India — Over inhalation of smoke from silencer

From the date I purchased the vehicle I am facing difficulties regarding over exhalation of smoke from silencer and break issues.I have already showed this vehicle four times for servicing in Grand Ihyundai, palakkad dist. Kerala, india.This vehicle has run only 4000 km .before two weeks also they serviced the vehicle .but, the issues are still remaining there and thereis no improvement related in the issues.I have tried to contact the showroom, but there was no responce from them and it is ashamed to think that hyundai only having this much responsibilities from you towards your customers.once again I am reminding you that this is a new car and if you are not recovering my complaints within a week, I will move towards legal actions.