Hyundai Motor India — Hyundai not honoring extended warranty and poor mileage

Address:

New Delhi, Delhi, 110025

Hyundai charged me heavily for extended warranty and not honoring it despite several reminders. Nobody is ready to answer my questions. Following up with them for the last four years.
Another big issue is the mileage of my verna car is very very poor. It is only 5 kms per litre. The company is always giving me false promise to rectify it but so far in the last four years did nothing.