Urgent refund request

Booked accommodation via booking.com, made payment for Lindokhule Holiday homes, with booking number ***, upon arrival we were notified that we will be sharing the Holiday home with other guest, which we declined and immediately tried to cancel the booking but could not. We had to book other suitable accommodation and had to pay once again. I've reached out to the property owner which referred me to booking.com for refund but have not received a refund or feedback as yet