Bajaj Auto — engine abnormal sound from the beginning

Address:

Curchorem, Cacora, South Goa, Goa, 403706

This is Pulsar NS 200 I purchased it on 17/10/2018. After a week suddenly noise started coming from the engine so went to the Sitara motors and they said the valve setting is not OK and they did the valve setting and gave me but next day again that noise started coming so I called them and they said it is an normal sound and it will get decrease after some days. So I didn't take it seriously after some days sound increased so I informed the same service center again they said there is valve setting problem and they did same thing again and gave within 3 months four times they did the valve setting but still noise is not decreased but it is getting increased day by day. And the same noise started coming in cold start also. The Sitara motor is not taking this issues seriously and they are not able to resolve this issues.
Hence the engine abnormal sound is from the beginning and it is manufacturing defect i I kindly request to the manufacturer and Sitara motors from where I purchased this bike to replace it as soon as possible. It is so irritating to hear that sound while riding.
I kindly request you to take the action as soon as possible. I had already complained before regarding my bike but action was taken. This time I want my bike replaced. There is a loan on this bike and I am paying EMI for this defective bike and if the action is not taken I will go legal and give letter to the bank saying I can not pay EMI because of the manufacturing defect of my bike until I get new replaced bike I will not pay single rupees.
Humble request to you resolve my issue as soon as possible.