Zoomcar India Pvt Ltd - Incorrect damage charges levied

This is regarding booking id JPS*BVKV. We rented an Electric car E** Dash on the **th of April. The car was not in good condition in terms of cleanliness and already damages were there in the car for which as instructed we took the videos and pictures of exterior and interior and filled the checklist. We called the customer care about the cleanliness and they apologized but could not do anything about it. We had to visit a place so we took a pinch of salt and went ahead as we were already getting late. We returned the car ahead of time by * pm though it was booked until ** pm and the executive there verified the car for a good * mins and then said we are good to go. The next day I got an email from Zoomcar that I need to pay ** Rs extra for extra mileage which I acknowledged. However yesterday (i.e. Apr **th ****) I got an email from Zoomcar that I need to pay **,*** Rs extra for a damage, no details of the damage were shared and I thought it is a mistake with their system and asked to validate and they came back to me within * hrs in the night (* am to * am IST) that they are valid. I told them that the charges are not valid and asked them please at least share what damages you are projecting and claiming for since no email or communication was done with me on this. They came back saying an underchasis of the vehicle was damaged during my trip and when asked to share a picture they shared some under the car picture with us. We asked them how did they know that they happened during the took the trip and they said they got to know this after inspection of the vehicle after my trip, which we don't agree since nothing happened during our trip and then executive asked me to prove by sharing pictures before I took the trip. My question is, how do you expect a customer to do the under the car inspection, we are no mechanics to do that and no instruction is given by Zoomcar that we need to take under the car pictures also.
When we asked if they can show us images or inspection report which they have done prior to we take the trip, they didnt had an answer for it. This is really bad from Zoomcar to levy charges which customer has never done and it looks more like a fraud. They are asking us to pay the outstanding amount within * days if not they will charge **% interest and then will file a case. What is expected to be done here?
* If the damage was there, why have we received the message which says there are only ** Rs outstanding the next day.

* Requested for the images with time stamp for damage but those are not provided yet, just one picture which doesn't have a timestamp and some under the car picture.

* Damage is reported after * days of dropping the car.

* No investigation proof provided from Zoomcar side. I asked for a previous inspection report with images prior to my booking and they say they cannot provide.