Customer service the worst in the world - what is British about Kulula !?

I’ve been holding on for almost 2 hours to get help on their helpline - I have screenshots as proof. The kids tickets have been booked on the same booking and one has contracted Covid in botswana so has to extend his return flight but earlier they said they can’t help in changing just one ticket - now I have been holding on for their assistance via phone yet been waiting for them to answer for almost two hours and still holding - needless to say they don’t have their email on their website just this help line where YOU need help after waiting for so long