Getting attitude instead of Refund

I changed my ticket dates on the website and paid R570 using my credit card. I waited and I did not get the reference confirmation. I called in the call center to be told they can't see my booking only the old one. I called my bank and they confirmed the funds went through and gave me Authorization number. Which I gave to Camalita from Kulula.com call center, she liased with Supervisor and came back saying the Supervisor said she can now see the funds in they bank account but they have not yet cleared. Suggested I pay another amount to book my ticket then they will refund me the 1st amount as soon as it clears which will be in 48hrs max. To be specific Camalita said Saturday morning I should get the funds. Today I called to enquire this and Spoke to Lisa who was very rude raised her voice at me when I asked her to get a Supervisor to contact me regarding this as I was calling from a work phone and couldn't hold too long. She gave me a run around telling me there are no remarks until I got upset then she said she will get the Sup to call me back. I have not received any call from Kulula.com till now. I held this airline in high regard but now I am very disgusted by their service and unprofessionallism. I demand for my refund to be paid back as promised and I would like a formal apology from this Lisa as clearly she saw me as nothing and not a valuable client to them.