Hyundai Motor India — Regarding warranty of battery

Address:

New Delhi, Delhi

Sir,
my self rampal singh car no; DL1RTA 0969 hyundai xcent.
i have buyed my car from sikka hyundai mayapuri they have told me that the warranty of car is for 1 year and 1 lakh kms whichever completes first.
battery of my car is got dead in just 8 months that is on date 18/08/16.
i have asked them to replace the battery and now they are denying to do so..
and they are saying for commercial vehicle they will only give warranty for just 25000 kms.
now they are denying there statement.
now i am helpless
please give me some solution regarding this.
as far as my knowledge the battery is guaranteed by its period not by the kms driven . so please give me some solution regarding this. thankyou...