Bad service

I've made a booking for accommodation in Franschhoek for one night through booking.com. Unfortunately we could not go because my husband was tested positive for covid. I've messaged the lady from the property and she told me to get in contact with booking.com. When I contacted them they refer me back to her. I've asked them to postpone the date as we don't want our money back but with no luck. This is so unfair, because we paid a lot of money for a service we did'nt make use of.