Flight bookings

We booked yesterday through our phone and we made sure we ticked on the 23rd of December when we booked nowhere does it show you again to confirm your booking dates.... they take you to the payment page we got a confirmation email about the booking made and realised the departure date was incorrect. We went back to the phone and just pressed back back arrows untill we came back to page where we selected the date of the 23rd of December. We immediately called Saffair and gave them a reference number this was not even 5 minutes after making the booking.. they had the audacity to bill us a penalty of R1350 to change the ticket departure date. That is more than our ticket to durban one way.... so dont be fooled... Imagine how many people this has happended to and out of each person they charge penalties for their system issues how much extra money are they making ???? This is daylight *******. I am convinced this was a system issue that we are now having to pay for... we called back again and the supervisor said they wont refund us... I wont recommend anyone to ever fly with Saffair again .