Tata motors nexon diesel - Tata Nexon desiel engine failure

My car tata nexon desiel * years and * months old engine got failure due to tata after service negligence (inspection failed after service)They are not sure wat happened to the engine and not able to diagnosis properly to fix the issue.blindly they are coating *.* laks to fix the engine issue since every service and oil changed did on time.And this is the first slot tata car and unable to sustain more than * years then what is the use of buying tata car it is totally loss for customers and I am holding unnecessary mental pressure because of tata after service.There no experts in tata motors after service they all are lack knowledge to identify the issue.I want tata motors to bare the engine repair cost due to their worst tata after service.