Marutisuzuki swiftdzire
Noking from engineside

I have purchased a new maruti swift dzire vdi last 4month ago from kunal motors chindwara.but during last month i m hearing nocking voice from engine side when i pick the car nutral to 1 gear after that the car is running 40-50 speed nocking is stopped.so last sunday 01-02 i gone seva automobile nagpur, i told the problem to engineers from seva automobiles, but it is shocking to me that atey did not find the problem within 2 days, i m very puzzled in 2 days due to inconvenience.my car no is mp 28 c 3519.my mobile no is 09425003738