DO NOT GO TO NEPTUNE MOTORS AT ALL. If I have to describe them in one word, they are FRAUDS.
I bought a car through them a year ago and I ended up spending close to a Lakh in repairing it over the one year. They cheated me buy tweaking the udometer reading in the car which was more than a 1,00,000 and showed it as 45,000. They used all sorts of chemicals to make the car shine to camouflage the scratches and other flaws. This is pure fraud and I hope the government shuts down the agency for cheating people. They do not let you speak to the actual seller.
In the interest of making money both the buyer (guess is involved) and the agency fool customers.