Systems offline for 3 days!

On 1 October I booked a flight for my parents departing at 12:15... 3 days later Kulula changed the flight without any notice and moved my elderly parents to 6 am. This means they have to leave home at 4:30am in the morning. We are not here to take them to the airport which means they have to take a risk with uber or some other means. I have been trying for 3 days now to get hold of Kulula. I hold on for 30-40mins at a time. Every time the eventually answer, they say that their system is down. I am at my end now and will insist on a full refund due to failed service delivery on their side! I will never use Kulula again and think they need to be closed down as provider!