They overcharged me due to an system error.

On 23.03.16 I booked a flight on flysafair online site, and I had change the return dates due to it being incorrectly selected. (I mailed them directly after the booking (5min later) and informed them that the date was incorrectly selected and I need to change the return date.) The online booking site kept on freezing while doing the booking. On reply to my mail they informed me that I will have to register on their website or call the service agents. While making the change the site kept on freezing and giving a time out error. Then I saw that the R600 (additional cost for making changes) payment that I made on the 23.03.2016 went off my credit card 3 times. So every time the site gave an error it deducted the payment off. I also noted there is a further deduction of R196 refM8Travelstart NB6084 CAPE on the 26.03.2016 after using your site to book. I urgently needed them to correct this mistake and to contact me regarding the refund. I then completed a complaint on the website 31.03.2016 after which I received a reply Requesting the card nr used. I rep**** 02.04.16 as well as 06.04.16 and still no refund. This was a system problem on their side and I now need to fight for refund<br>