Zoom Car — Refund not received and unethical behaviour

I'd initiated a cancellation of my car booking on 29th May, 2020.
As the Zoom Car company claims, they gave me a word to return my money within 15 days of time.
However, not only did I not receive my money till date, they have also stopped replying to my emails.
Additionally, their customer care number is highly vague as nobody responds on that. They have legit wasted my hours by keeping me on hold for no reason.

I'm looking for an urgent solution for my money is stuck with Zoom Car.