Amaron — Battery exchange issue in warranty period

Hello,
My name is Somnath, My bike battery has got problem. It was checked on Amaron pit shop and during checking it was clear that my charger is giving a Voltage of 14.2 Volt after starting the bike but during start the voltage across the battery is getting dropped to 8 volts but after that also the Technician who was checking, told me that it requires charging and for that I have to give the battery for 2-3 days but my bike has no kick start and they are not giving any service battery. So kindly help me in this matter. Being such a big company you should support customer in this regard. My mail id is [protected]@gmail.com