Harsh Booking Rules

I booked a flight that cost R6309 for my wife, my wife cannot take the flight fro personal reasons, I still wish to use the flight but mytrip.com or flysaa are not allowing me to change the name. I chose the no support option but surely, like other airlines, you can pay an admin charge, and change the name. I have the ID of both people, the credit card that purchased the ticket. You dont even request an ID number to book the ticket. I cannot lose R6300. Please help