Comair/Kulula Service has been appalling

My wife and 1 year old daughter are in Holland visiting family. We had to book a new return flight due to Covid cancellations. We then had to change their return flight to Port Elizabeth from Johannesburg. This has taking almost a week. No operator answers calls, I have tried multiple numbers for in total over an hour on hold. I have sent emails to 6 different addresses and still no one is able to assist us. The strange thing is we have used them many times before, and have had really good service when we have had to cancel or change flights. The only answers we get is from Facebook Messenger, however they can only do so much.