Kulula Stole my money

In fact rating Kulula one star is an insult to the star. They deserve zero star. They keep my money for flights cancelled during COVID. Can get e-mail confirmations from no-one - Luvo (Monday), Fatima (Wednesday), Xola (Thursday). Ask to speak to the supervisor - Bianca DuPlooy, nope no luck - hold on for 1:07 minutes now on the call. Yesterday was 45 minutes. Monday was 40 minutes. Trying to change the "banked" flight to make use of it before it expired date and get told that I have to pay in R 4 591.08 over and above the R R 4 200 I paid for the original flights. Kulula are outright ****** - they stole my money and are now trying to ***** even more. Where do I go to fight them? I want my money back as I have to resort to other airlines now.