Bajaj Auto — Dominar 250 engine issues

Address:

Jai bajaj Tambaram Sanitorium

I bought my bike on February 17 2021 from Jai Bajaj, Tambaram Sanitorium and I was literally enjoyed everyday till around 5000 kms. The main thing that impressed me is the exhaust note. It was bassy and pleasant.
After some 5.5k kms, I noticed that my engine was getting louder. I thought that I am being obsessed with my bike and the bike was fine. After around 8k kms, all I can hear was the engine sound and my exhaust became very silent. I can hear rattling kind of sound when decelerating after riding for 15 minutes.
When I took it to the service center at Guduvancheri, those guys were like this is very common in Dominar that the engine becomes loud over time. They made me believe me that I was the one who's wrong. Then I met other users and they were able to notice the difference in my bike.
So I took the bike again to the service center. This time to Jai Bajaj Tambaram Sanitorium where I bought the bike. They told me that there is some noise and took 4 days to return my bike. They didn't change any part and didn't charge anything but told me that engine components were tightened. After I went for a short spin I was able to notice that the noise is not gone. I came back and asked them and they told that this is the normal sound of my bike. They were like they just want to get me out of there.
But again when I compared with other users I can clearly see that my bike's exhaust note is very silent and my engine is loud instead.
My bike is just 13k kms old and I loved my bike for the exhaust note and now I feel very irritated to ride my bike because of the unbearable noise from the engine. It really spoils the experience
This really breaks me and I must say this is very poor customer service from bajaj.
I am Naveen and this is my experience with my dominar 250
TN 22 DT 7358.