Honda 2 Wheelers India — Engine manufacturing defect not getting in warranty

I own Unicorn 150 and having engine vibration and abnormal sound problem in my bike at 5000 km only I visit to service center they tell me to change the timing tensioner of the engine I agreed and change the same and paid for timing tensioner and and labour of the same. But my problem doesn't solved I again reached to the service center now they said to change other engine parts to resolve the problem. You are giving 2 years warranty and not covering engine manufacturing defect totally unsatisfied. I want solution for Engine Manufacturing defect. Raises complaints many times but there is no response. Wrost service experience ever.