MISTAKE ON THE TICKET

I made a booking with SAA and there was a spelling error on my sons surname instead of "VU" there is "UU" - i phoned in this morning to try and sort out this thing.. I was asked details on when I made a booking and I was advised that someone would call me back within an hour -i never got a call back from anyone at SAA - I then phoned back SAA - they kept me on hold for a good 20 minutes trying to get the same information I gave previously - I was transferred to a lady called Marcel - who told me that a new booking has to be made and new payment has to be made after she listens to my call - I am the mother of the child and can not afford to pay for another ticket - she told me that a refund can only be done after 7-21 working days - yet my money it only took them 2 minutes to take it out - I asked if they will accommodate my son if I'm to board till i come back as i do not have money for a new ticket -