Hyundai Motor India — complaint against showroom authorized dealer

Dear sir i brought new hyundai creta car in our lockal hyundai showroom named mango hyundai 8 mounth ago, they make deal with me seat cover, tefelon coatting & chasis paint but still they are not making his promise true, means still they didnt finish jobe so many times i call them they ignoring me but they still teling me come back after week, they make promise to me, i just want to finish my problem, now i am thinking i made mistake to buy hyundai car, they are not risponding custemer,...