Gaadi.com — Exchange Bonus Not given

Hi,
My name is Anselm.Thomas from New Delhi India.I purchased a new car Hyundai i10 era through GAADI.COM and also sold my old car Santro Xing to them.Now at the time of deal Gaadi.com told me that i will be eligible for 21000 discount for Govt. Employee and Rs15000 for exchange bonus as i sold my old car to them.Now its been 3 months i have not recieved my exchange bonus which they committed and even calling them several times they dont bother to respond.I am in great loss of Rs15000 for my exchange bonus, because of the carelessness of the company (GAADI.COM).Hyundai refused to give me the bonus as they did not mentioned at the time of purchasing my new car from Hyundai.Please help me to get my exchange bonus and take some disciplinary action against the company.
My Cell Number is :[protected]

Thanks
Anselm.Thomas