Yamaha Motor India — Battery Discharging

My new Fasino hybrid battery is Discharging continously. I visit the Showroom for 3 to 4 times. They said the battery is compliant so we can replace a new one, at that time they given another battery for my use, but the battery is also Discharging continously. They don't check my vechile only replaced a new battery.
They don't give me any bills or paper for the replacement of the battery. They are said that there is no bills for paper for the replacement