TVS — Engine sound and Service

I bought a bike from Indian Motors agencies TVS bellundur. From first service some noisy sound is coming from engine. I gave my bike to sarjapur indian motors and they took my bike for 5 days but nothing improvement from engine side. Again i gave my bike to bellundur indian motor agencies for 2nd service and thought they will repair my bike but again they said part is not available and you have to leave your bike for 2 days atleast. Now I'm frustrated from this tvs service and thinking to sell my bike within 3 months.