Hero Electric — Fake Range and Mileage Claim and very poor service

I have Purchased Optima Hx city speed from Karne Electronics, Phaltan, Satara dealer.

As per brochure and company claim, the range for hero Electric Optima Hx city speed is 82Km/charge.
But the actual range on use is just 50km/charge. We have charged battery 10 times fully. Tested for 1 month.

Service center head has not been provided satisfactory solution.
We have visited phaltan showroom for 5 times. But no resolution for 50km range per charge.

Charging time claimed by company is 4 hours.
But the current battery takes 6 hours to charge full.

Also battery as per specs is 51.2Volts
but battery fitted is 48 Volts.

Dealer is not ready to replace battery.
And company boasts for battery replacement warranty for 3 years,