Sail UVA Car Response is too Bad

At the time of purchasing the Sail UVA Diesel Car. Sales Representative says that this car will give you 22.1 km average per Litre. However, from the starting it is giving 5 - 6 km Average per litre. When I Complained to the service department, they didn't respond to the problem which I am facing.

Finally, On May 8, 2013. They did the drive test 3 times and found that yes, car is giving the Average of 5 KM per litre. On May 18, 2013 they handover the car to me with this statement that now the average of your car is good. I again complaint on May 20, 2013 regarding the Average Issue and still the car with them.

Have a strong feeling that Chevrolet company stolen my money by giving me the wrong commitment regarding the Average of Sail UVA Diesel Car.

Nowadays, I am crying with Sail UVA Diesel because I Purchased the Sail UVA Car by taking the SBI Car Loan and Average of the car is too bad, their service department is too bad because they doesn't provide me the solution till date, response is too bad because I sent a email to them 4 days back and didnot receive the positive response till date. from the service department, I am waiting for their response since May 8, 2013. Why I purchased Sail UVA ? I am asking this question with me every minute.