REFUND OWING TO ME SINCE 10/02/2015

I flew from Cape Town to Johannesburg on 10/02/2015. I added an extra bag to my booking but I was charged twice. I have sent numerous emails and made telephone calls but have to date not received my refund for an error in their billing system.<br> <br> I received a call from Joy who said that she will get someone to call me back but that has not happened.<br> <br> The service sucks, all I want is my refund paid into my credit card account immediately. I am tired of being given the run around.