TVS Motor Company — tvs ntorq - battery discharged within 1 year of purchase

Address:

411057

Purchased tvs ntorq from ramkay tvs, july 2018. 100ft road, velachery, chennai.
Within a year there were many instances of self start not working.
Reported few times to service center, but they couldn't pin point the exact issue.
Finally a week back, i saw battery sign on the screen, self started was dead.
Got it checked from bike repair center, they checked battery and advised to get a new and check with tvs as ideally new battery should last for about 3-4 years.
I have kept the old battery with me.
Please advise how to claim refund as i already bought new battery.
Or what can be done in this case.