Unacceptable wait for refund

I booked a ticket for the weekend of the 5th February a few weeks ago. Last Friday I get an sms to say they have moved my times which are not convenient for me so I had to make alternative arragements. I struggled to get hold of anyone at Kulula for a refund, eventually get through and get told I will wait up to 6 weeks for a refund, what utter *******. I paid for my ticket immediately on booking and have had to pay more money to fly with a different airline, I do not see why i should wait 6 weeks for my money as you inconvenienced me and I am now out of pocket. This is just unacceptable and I will never fly with Kulula again and I travel frequently!!!!!!