Tvs Motor Company — battery warranty

Address:

62, Momin Road, 4000

I bought a tvs stryker 125cc bike in november 2018. Installed battery was dead, many times i asked to replaced or fully repaired. They didnt listen. Always change the battery water and charge. After two days battery again dead.
But finally they took my battery for replace in march 2019. They asked me to wait 15 days. After 20 days i didnt get any response and i called. Today is 55th day and i still dont receive my product.
I am from bangladesh. Where i can complain about my issue?