Inconvinienced and lost most because i had to cancel a contract

I booked SAA on Wednesday 23 after 10pm to be on the 24th 6:25am flight to Bulawayo from OR Tambo. when I got to the check in point on the 24th around 4:30am I was told my tickect had been cancelled and was asked to go to the service desk. When I got to the service desk they told me I could not get on the plan because card validation had not be done, in response to that asked them why no communicaton had been done to me earlier so I could make alternative arrangements. at this point in time I was left stuck, money had been deducted from the account used to pay for the ticket so I couldn't rebook on the next flight. I tried to explain to them that I really needed to get to Bulawayo that same morning because I had a function I was catering for ( value of $750) but they refused and were very nasty to me . because off all this I was forced to cancel the catering job with my client and I lost $750!!!.

today is 27/08/2017 and refund of R 2374 for the ticket has still not yet been processed!!! what AM I SUPPOSSED TO DO!!!????