SAA lost money due to bookings failure

I booked a flight to Rhb on the 17th March. Due to the corona virus I have to move it to 13 May. Numerous phone calls, taking extremely long for someone to help, even an hour of waiting.

They said to move the booking online, because they can't cancel it. I paid an additional amount of money, to change the booking, however the change was never made by the system.

After phoning them again, they said to phone the next day, as it can take 12 hours. Could not reach any one, at the call centre the next day. E-mail was also send, with no reply, up to today even. I lost all my money, with no results. I would like to be compensated for the lost amounts, as both the flight cost and booking change cost was debited but not actioned at all by the system.

All changes were made more than 24 hours in advanced.

Was booked with flight reference SSKAAY to Richards bay.