@bhavneet this forum is not happening forum like teambhp.
Well! Coming back to your ride. It's not the engine mounting problem. Get the diesel filter(disposable one) renewed and the diesel pump has a strainer, in the fuel tank, to be inspected and get it cleaned. Inspect the air filter and clean it, refer any YouTube video for that. Problem with the diesel car is that if any of the fuel injector under-performs the vibration issue will start. Can you ask some service guy to check the peak pressure(bar) of each cylinder, all the four readings should be nearly same, if value of any one is less than the average value by 5 bar then that fuel injector needs overhauling, this last step is extreme. The problem would either be clogged air filter or clogged fuel filters.
keep us updated.