Kalula Bookings not good

So......I quite often fly.......every 2 to 3 weeks as part of my work. A month ago I bought 6 tickets for a weekend brake away..... Now the one person can no longer go due to work commitments. This weekend away is in 2 weeks time.....So I just wanted to take another person with instead. Kalula tells me they do not do name changes, therefore I will lose my money and 1 ticket down the drain....My company do big group bookings through Kalula...... I am extremely dissapointed in them.....also the fact that my 1 ticket is already booked and paid for, for one of my flights next week..... this will be a last for me...