Cars24 Services — Faulty car sold with diesel leakage warranty issue

Address:

788 guruwar peth Punch howd Opposite tower church

I bought the car from cars 24 in March and I was outstation in June and July month. My car was used by my wife and there was diesel leakage in the car. The car was under warranty as km was just 7000 and within 6 months. My wife called the service team but no one called her back
I came back and raised a request 14 August for this issue and got it escalated. now the company is telling me it's outside warranty as the km is more than 7500. I provided them the proof of my wife calling them in June but they are not even responding.