Federal Airlines takes your money without services rendered

We booked and paid for 2 seats on their shuttle to the Lowveld for 26 May. This was booked and paid on 21 May at 15h32. At 09h15 on the morning of the 22 May I realized that I had booked the incorrect date and asked them amend it to 24 May. They could not assist with availability on the 24th May. They charged us R7800 (75% cancellation fee) for cancelling the flight on the 26th May. Then refused to allocate those funds to another booking on a different sector. No operating costs incurred by them, and under the circumstances and time frame of me realizing my error and correcting it, I do believe that they are extremely *********. We are not the first to experience this with Federal Airlines. I encourage other people who have suffered these ********* losses to step forward.