Zoom Car — Refund not being paid

Date of the incident : 22 may - 15 may 2020.
Client name : zoom

I booked a zoom car for the above 3 days. I paid inr 8, 242 as an advance. On my return, i received information from zoom that the total cost of the trip is inr 6, 585.
I was supposed to get a refund of inr1, 657 within 7 days. This refund amount is showing up on their app and it continues to show as refund not paid.
I have called them many times, sent many emails.

They just do not respond!!!
Please help me recover this amount.