Kulula double charged me... 8 weeks to get it back

I attempted to book a business flight through Kulula using their online booking system. Once they had actually charged me for the flight, the system proceeded to tell me my booking failed and that I had to pick an alternate payment method. So, I repeated the process, thinking the other charge would simply be reversed as I had not received the booking confirmation. Unfortunately, that was not the case. Kulula kept both charges, and not even my bank could reverse a single charge. After getting in touch with Kulula, I was informed that I would have to wait 8 weeks before receiving my money back. Simply put, "this is how the system works, sir". So in essence, the airline has ****** me for a two month period and I have to find some way to make do without that money. I find this unacceptable, and informed them I would escalate this to a public forum. Booking code QXJXIA. Reference 12903. Needless to say, I will not be booking another flight through Kulula.