Request for a refund

I made a booking in December 2022, when I arrive at their service provider,I was told to introduce a credit card facility of 4000 rands,which I didn't have. I called them to cancel the booking before booking time. But I didn't go through because of the inefficiency of cancellation department. When I request a refund. I was told that I will only get one for insurance. Which I got. But I still want the refund for the car rental.