FlySafair refused to give money back within 30 minutes of booking

I booked a flight and made a mistake with a date, instead of 30th I selected 6th Feb. Within 30 minutes I realised my mistake n tried to cancel because I couldn't find a suitable flight of the same day. I spoke to Lesego and later to his manager kuren. I explained that I understand the R300 penalty but can I ha e the R430 to make other alternative arrangements, I was told I will be given a voucher to book for another day I explained that I cancelled within 30 min of booking that ticket n i paid cash j am i now offered a voucher which is not belong me at all, remind me again why will I consider FlySafair in future if they dont understand that there is something a finger error. People who refuse to give your money back even when you explaining your crisis. I wanted to book a bus since I couldn't afford the R2000 flight I was offered.