Hero Motocorp — My vehicle hero duet

My vehicle hero duet battery was not working. I purchased the new battery on october 2019 and now my vehicle battery is completely discharged. The service station of hero duet in charbagh near balrampur garden lucknow has taken my vehicle for servicing and for changing the battery on 17 August 2020 and then they called me up on 18 August 2020 that your vehicle is ready but they did not provide my vehicle as the battery got completely discharged after charging it by their employee. Since 18 August they are making me fool that the battery is not available in the market and will come after 7 days and when again I called them up today i.e(25 August 2020) they are again making an excuse that the battery is not available and it will come after 7 to 10 days. They are charging me 1600 extra for new battery altough my battery is under warranty and when I have complained in customer care then the girl over there was in favour of the workshop that the battery will come after 7 to 10 days. She did not file my complain. This complain should be taken seriously and serious action should be taken against the workshop or else I will report this case to higher authorities. I want my complaint to be registered immediately.