Unfair business practice

I made a booking with flysafair on the 6th of September 2022 for January 2023 and unfortunately one of the passengers decided in December 2022 that she can't make it. I called Flysafair and canceled, not only was I charged R300 for the cancelation(which is understandable) but I also was given a year to book and I find it unfair because my initial booking was for a vacation. I don't travel a lot, I called to get an extension and I was told a straight no, it's not possible which means if I don't book before the end of December 2023 I lose all my money. This to me does not sound like Flysafair values their clients.