South African airways ticket cancellation

I book tickets for my family on Friday 27/02/2015 on SAA's 72 hour sale<br> The price was ridiculous but real at R860 return Jhb to Abu Dhabi <br> I chose the dates booked and paid. SAA sent me confirmation,reference number and emailed me the etickets.<br> Monday 02/03/2015 I receive an email saying it was an error an they will not honor the sale<br> Can they do this?