Moves seat and refuses to give window seat

Hi, I am very disappointed in Kalula. I travelled on flight MN512. I checked in 8pm the previous night to ensure I get a window seat. When I arrived and had my ticket printed I was told my seat was changed to a middle seat due to plane change. On top this I printed my ticket 2 hours before boarding. I then asked them to move me to a window seat as before but Carmelle Chetty refused to do so. I even went to your ticket booking area and again asked for help as I suffer from cluster fobia and feel more comfortable at a window seat. The friendly lady Roahna phoned Carmelle again who refused to help. As a result I had to rush to have dinner to be on time for my flight due to time waisted trying to move my seat back to a window seat as I booked with my check in. They could have easily given me a seat for somebody who wasn't checked in yet but Carmelle did not care. Also when we eventually took of I saw a window seat that was unused. As such it is clear that Carmelle could have assisted me. I will as a result never use Kalula again. My flight home was very unpleasant. Also cabin controller Wayde was making fun with the rest of a cabin crew about a customer who did not want to move from his seat to a seat with more leg room due to his hight. It was disgusting to hear how he clearly has no respect for your passengers. He said that if the guy wants to sit there and "eat his knees" then that is fine.

Regards Marco Ashford ********** 112