i am using bmw 3 series dl 2cq 2677 320 d i have use it only 53000 km & i dont knw how before 15 days it didnt start itself then i call bmw peoples & they take my car to there service centre 7 they told me that my control unit is gone 7 for new one you have to pay 49816 rs & they gave me estrimate vide document no SQ 73813

i m so much surprise that how control unit can stop working so soon
as i know BMW is world class brand 7 if control unit is not working it means there was some manufacturing defect
so kindly change my part free of cost