Bagga Link Motors — bajaj avenger 150 street

Address: New Delhi, Delhi

It's only two years that i have purchased my bike. All the services were done by authorized bajaj service centers. From the last 6 months, my bike is having some noise from it's engine and chain part. I complained when i had my service, but they just throw some oil in the chain set and over the engine and told me it won't make any noise anymore. The same happened twice in 6 months, when i visit to service my bike.
And 3 days ago, i again visited the same service center, and the center manager was telling you will get the same noise even if you drive the new bike or even if you drive a bicycle.
This was happened with me at bagga bajaj service center, wazirpur industrial area near azadpur, delhi.
Please help me get rid of this noise before my bike's engine actually blasts.