worst service ever

So my children booked their flights home from varsity and then the country when into lock down again, so Kulula decide not to fly, now they are trying to rebook using the vouchers that they already paid for, no response to 3 emails and over the past 3 days I have held on to speak to somebody for more than 30 minutes each day and have not had their phone lines answered once. So no answer on email and no answer on telephone, no wonder they recovering from business rescue because they feel it okay to charge customers and then make it impossible to get flights actually booked.