BMW India — electricals have not been installed properly causing battery drain issue

Hi team,

My car (Bmw 320i - 2009 model) met with an accident on 28th august 2017 and was sent to infinity motors in turbhe mumbai. Vehicle did not start as the air-bags were blown and found the vehicle to be in working condition after the security sensors were shut off. Bmw verified all the electricals and the vehicle was kept in the workshop for repairing. After 2.5 months and spending 7 lakhs, the vehicle was released in november with a battery problem. The battery drains overnight and infinity motors is insisting on getting it replaced with only a reason that it is more than 3 yrs old. When the car was inspected during admission to the workshop no electrical problems were detected and since i've got the vehicle, we have a starting problem every day. The voltage was checked and found to be proper with good charging conditions. The entire engine was removed and re-mounted which could have caused battery leakage issue. Now bmw is asking me to pay more for getting this fixed. I need to have a complaint launched against infinity motors for messing up my vehicle.