NO response on refund from grounded flights

On 12 March 2022 i had a flight scheduled with Kulula from Lanseria airport to Durban airport at 11:30am. Unfortunately ALL flights with Kulula was grounded whilst I was waiting at the boarding gate and so I was unable to fly. I have called Kulula 72 times and I have emailed Kulula 32 times to reschedule my flight and I have received NO response and I hold on for hours on end. I have emailed Kulula travel bank in order for them to refund my flight into my Kulula travel bank and yet NO response. This is becoming absolutely ridiculous and the service is disgusting! You are so quick to take money from travelers but you refuse to refund. Give me back my money or allow me to rebook! I have been ignored for weeks now and I don't know what else to do or where to post anymore.