Amaron — disappoint from amaron, battery is replacing even in warranty period.

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

I really disappoint from amaron service, i bought amaron pro bike rider date (12/12/2017) serial number (Bac 0241r502080 or abr-pr-12apbtx90).
I have issue of battery discharge, i visited to service center twice they kept battery for 24 hour and fit same battery to my bike and give excuse that battery is discharged.
I specially visited to bike mechanic to check my bike dynamo is charging my bike properly.
He passed ok with every condition from bike side.
Then why amaron is not replacing my battery, if you don't able to change then answer it clearly, i will buy new battery from another company dealer.
Please revert asap