Luminous Power Technologies — low battery backup

Address:

Bihar Sharif, Sohsarai, Bihar, Nalanda, Bihar

My luminous battery covered under guarantee period, i have complaint service center due to battery backup very low. But service centre no responding, his works only harassing customer. I want replace my battery at the earliest.
If so, i shall be highly obliged
Thanks,
Name - aman kumar
Mob. No. - [protected]
City - bihar sharif
State: bihar