Bajaj Auto — Unwanted Engine sound and Battery Issue

I purchased Bajaj Pulsar 125 BS6 on 12th Feb 2022.After first I got issue with self start and odometer display blinking issue. I went to service center and they said it's battery issue. They took battery for replacement three days ago and still no information about it. Now some unwanted noise is coming from the engine from last 3-4 days. I just got fed up with this issues. I am a working person and can't go to service center again and again. It's 12kms away from my residence and they don't give drop and pick facility.
Please help to resolve the issue otherwise I have to go to Consumer Court.