no value in being a loyal customer

I booked online for a flight I've taken frequently over the past months on Kulula. I never thought to check the email as I had booked the same flight so often. When going on-line to book in, I saw the mistake in the time of the flight. The call centre said that I had to pay extra, which turns out to be the same price as the flight, meaning that the charge was actually double what I had paid in the first place. There is no proving that the mistake was mine so I had to accept this. My complaint is in the lack of loyalty to regular customers and the extremely high cost to change a 1-hour flight to an earlier time, same day, just a few hours earlier. The call centre staff varied between really helpful, extremely patronizing and rude. The 3rd person I spoke with (Faith) was actually helpful as much as was possible. I won't fly on Kulula again given this lack of loyalty to me as a customer and the punitive charge for a for extremely simple change like the same day, same flight, just a few hours difference.