i buy the car maruti SX4 in august 2009 from

fairdeal cars pvt. ltd ,jhilnil ind. area ,dilshad garden,delhi .....

and get fitted with cng kit of approx Rs48000 ..but till now my cng kit giving the problem from very 1st week when i have purchased ..i have complianed it many times and they did also but problem could not rectified then i asked them to changed the cng kit they did that also and changed my cng kit also but till now the problem is same ..now i have asked them to return my money back and take their cng kit back ..and they refused to it