Kulula messes up both to and from flights!

Let me explain how bad Kulula messed up our holiday flights costing us way more for our holiday! And much lost costs for them as well! Bought flights in July 2015 and paid. Our flights were for 21st Dec and return on the 3rd. I inquired in Dec how much it would cost for coming back on the 6th Jan, was too much and left it. Arrived at OR on the 21st, on time, they decided to upgrade their systems - everything was then manual - nightmare. They then stated I changed flights, and had to be re-issued - the guy in the call centre made some changes without my approval, they then had to listen to the recordings etc. 1st and they caused us to miss our flight, which they then had to make emergency plans, and then also for the 6th now returning, as no other flights available. They gotus onto a flight after kids were falling asleep on the floor, and even gave confirmation of rts on the 6th. Comes the 4th I inquire, couldn't find booking again! After much calls, they managed to book us on a later flight. Absolute nightmare - have all prove and comms - costs us about 6k extra, which I want back!! Futher, fot a sms to say they also had flight booked fo 25th, I worked out they must of lost 30k!