Hero Motocorp — I am complaining about my hero duet.

Hello sir
There is a problem in my Hero Duet gear box since purchased date. I have complaint many times in my nearest Hero showroom SHIV SHAKTI HERO MADHUBANI (BIHAR) also purchased from here. But no any response taken from him. They told me that we have no parts for duet gear box... We have ordered when we will got that parts will ping you. On 30 December 2017 they informed me that we got the parts please come with bike. I have handed over the bike on 3 january 2018. They told me that leave the bike for one day I will ping you tomorrow. But till now[protected]they don't have handedover me the bike. Please help me. It's a request.
Thank you