Jahnavi Nissan Bhubaneswar - Harassment by the showroom by delaying to work my car

Good morning Sir
I'm Mahesh kumar Mahapatra, a honest customer of your nissan vehicle who blindly believes everything regarding the car of Magnite and on **/**/**** , I bought a new car from Jahnavi Nissan showroom, Bhubaneswar, Odisha showroom with the vehicle no-OD**CJ****. They told me about the insurance that to add me in their Nissan insurance and whatever the problem they will handle regarding the insurance but on **th August **** my car has faced an accident and when I claimed it on next day of my accident , they didn't take any single type of responsibility and when I got to know about the insurance which is known as Zuno general insurance which is such a useless insurance having no office in odisha, giving my responsibility to a thrid party and they are torturing me a lot. After giving all the said documents also they are showing such useless excuses that my driver's (my own brother) google location is not matching, after clarifying that the person who came for the investigation have been checked my mother's phone that my brother is using after the loss of phone during accident and we have also the medical report of my brother in that night they are not listing anything. It's been already ** days and my car is in off road. You kindly decide what should I do in this situation. How we will believe on Nissan India. My two friends are also asking me about Nissan car what I'll tell them whether they will by or not. And yes, as for this problem, I have already been facing so many hurdles in my business and for this . I hope you will understand me and will take immediate action against those careless managers of Bhubaneswar based Nissan showroom. And will give a satisfactory results to me.
Thank you
Mahesh Kumar Mahapatra