Hero Motocorp — I'm complaint against engine sound

I'm purchased a hero motorcycle i-smart on 26/09/2016. After purchased this motorcycle i realized that a very bad sound made from my moto.. I complaint to my hero dealer cynosure manik's auto center. They had just overlook my complain, i reapetedly complaint them but they can't hear me or take it seriously. So i'd feeling harrase. I pray to you please relieved me from this major problem.