Zoomcar — No response from customer care for refund

I hired zoom car & completed the trip on 17th june, 2020.
There was a refund of rs 1600/- which i have not received yet.
I tried calling zoom car customer care for n number of times but didn't get in touch with anyone.
Even i tried writing so many times but didn't get responded a single time.
I have been charged twice from credit card department from which i made this booking due to this refund amount.
I have never ever seen this worst service from such a big brand.
It was better to take car from some other agency.
Kindly help me out