Zoom Car — fraudulent charge

I have booked a Zoomcar (Booking ID JPS66V82E).

While trip started, car didn't get unlocked using App and customer care tried unlocking it over call but it didn't work.
They have called owner for second key and owner came and handed over key after sometime and I have took the car.

While returning I have fuelled the car, it got stopped at a location and I have called customer care number and informed the same. They have informed that fuel indicator is showing low fuel and immediately I fuelled car with 6 litres. Even though the car didn't start back. Zoomcar asked me to leave the car at location and leave.

I did the same and now Zoomcar charging me 6670. They are calling me and harrasing me about the same.

I informed them that I have fuelled the car and it didn't start. I had to book Ola to reach home back on my own expenses. This is not my mistake. I'd have fuelled the car if it is low fuel coz the car stopped quite opposite to a petrol pump. I had to fill in 500 rupees petrol instead of the fraudulent charge of 6670.