Double Charging

When you do a internet booking on Kulula and proceed to credit card payment and press go to proceed, the system hangs for a few minutes and gives you an error, so you naturally re-start the process, which then goes according to plan. But you then receive two confirmations and two debits from your credit card. When you call the call centre they acknowledge the problem, but they say the reversal will take between 6-8 weeks to reverse. So is Kulula collecting interest while the money is in their account and reversing the charges after the 6-8 weeks.