Unicorn — Complaint for service at Ganpati Autos, Ggn

I'm a existing customer & complaint is regarding the quality of service from Ms Ganpati Autos Ltd. Gurgaon.
During all the regular services from same dealer the water level in battery, & terminal cleaning was not checked as per schedule as a result it's one of the cell has become weak, now it's showing self start + all battery related problems, which now needs replacement.
The last service was on 09/06/09.
Please look into the matter which has troubled me the cost of battery.
Below is the details:
customer code :CU45461
Product: UNICORN
FRAME NO. ME4KC098L78055570
REG. NO. HR26AP4708