double charged and nor refunded

I booked a flight online on 27 May. I doubled clicked on the pay tab and was charged twice for the flight. I called the helpdesk the same time and the lady advised it will be revered by 7 days. its over a month and nothing. I called the call center on the 23rd to follow up. a lady said she will investigate and come back to me, but no one ever did. please get someone to call be back to rectify this matter. the charge was r2505.14, but this was taken off my account twice. please call me.