Zoom Car — false damage charges of rs 6000

I made a booking at zoom car (Id: jps62owys) on 24 dec 2017. This is my 6th booking and every time i have used zoom car, the car was parked in forum mall or garuda mall (Bangalore) and there was always a zoom car executive to facilitate the pickup and drop off.
But this time the car was parked on a road. I had to pickup the car at 00.30 am, but because i could not find the car after searching a lot i called up zoom car and finally was able to locate the car.
After using the car, i dropped off the car well before 5.00 am (Which was my drop off time).
During the time the car was with me there was no damage done to the car.
After about two or three hours i got an sms that there was some damage done to the car and i have to pay rs 6000.
I called and raised a concern. They told they will check and get back to me.
After one day i got a call that they have checked and i have to pay 6000 rs.
I said there were some scratches on the car when i picked up, so they asked me to send photos, which i did. After seeing those pictures, they called me again and told that they have not charged for those scratches but some other ones.
Just because they could not arrange an executive to check the car upon drop off, which could easily avoid these kind of issues, they are asking me to pay.
One more interesting thing is that, forum mall is within half a kilometer of the road where this car was parked.
Why could not they have arranged the pickup and drop off at forum mall, where there is a designated area for zoom car and always there will be someone for inspection during drop off.

I request them to stop harassing the customer, revoke the charges of damages which was not caused by me and instead take more responsibility to arrange an examiner at the time of pickup and drop off.