Zoomcar — Outstanding amount

I have booked a 7 seater car for 4th june and it has been changed for 3 times by them for unnecessary reason and finally before 2hours from starting the trip the allocated a 5 seater car instead of 7 seater and mentioned that RS.999 will be refunded and it will be covered under the given amount after finishing the trip they are telling to pay an amount of 2851 as an outstanding amount i have already paid an amount of 3676 which includes amount for door delivery for an 7 seater car