May Day - Kulula going down

I booked flights for my two sons and I departing from Durban on the 24th of November and returning the same day. The outbound flight was booked departing 6am and landing 7:05am. The return flight was booked for 15:25 landing 16:30. The purpose was to fly to Johannesburg and renew my children's Dutch passports at the Dutch consulate in Pretoria. The cost of the flights was R4,004.04 and they were booked in September. I subsequently received notification from Kulula to say that the times of the flights for my sons and I had been changed. The outbound flight had been changed to 8:45 with the return flight changed to 11:55. These flight changes did not give me sufficient time in which to make our way to the Dutch Consulate, renew our passports and return to the airport. I tried reaching the call centre numerous times (since the 4th of October) to query the change, but it is not operational - the same message is repeated, namely that Kulula will contact me within 72 hours of the flight. This is unacceptable as the revised times do not accommodate the times for which I need to land and depart - and the cost of booking alternative flights increases with the passage of time. I reached out to Kulula and explained the issue on their facebook page on 4 October 2021 and received the following message: “Hi Greg, flight have been change or moved due to operation schedule requirement, Due to high volumes, at this time we are only able to assist if you booking is in the next 72hrs, kindly email *** for further assistance. -LP” I subsequently emailed *** on the 19th of October and advised them that I could not wait until 72 hours before departure to request a change to the flight as I was concerned about the availability and cost of flights. I advised that I was compelled to make another booking through flysafair at additional cost and I requested a refund of the R4,004.04. No feedback or response was received to the above and I so I emailed Kulula again on the 16th of November and then again on the 23rd of November. To date I have not received a response. I appreciate that airlines have experienced a torrid time as a result of the Covid restrictions, but Kulula will not weather well if its post-Covid service levels remain as they are.