Kulula not a caring company!!

I am very unhappy about the service at Kulula. I made my flight bookings on the 16th of August 2018 booking number IXANDD. When I booked my flights I also did pre seat bookings and paid almost R1000 extra for both the flights from Lanseria to Cape town and back. As this is my husbands first time flying I wanted to make it special by pre booking row 1 A,B and C. Today when I wanted to check in online no seats where allocated. I then contacted Kulula to inquire why my seats was not pre - selected like I paid. After about 20 minutes of holding the line I was not given a satisfactory answer. They only told me that they will pay back my money in 6 to 8 weeks. Firstly its not about the money it is about my husbands feelings and secondly when you book a flight you need to pay your flight immediately not in installments or 6 to 8 weeks before departure. Then I contacted Kulula again and Andrea at Kulula informed me that I am now booked for Row 15 A,B and C. I was then informed that another plane was being used. I don't care because a plane is a plane and the row that I pre booked is still the same even on another plane. The people that are now seated on my seats could be contacted and they can move to row 15. Why must I be inconvenienced. I am very unhappy about the service and the unprofessional handling of my booking. If there was a problem with my pre booking seats why didn't Kulula contact me and discuss the matter. Kulula are not allowed to change my seats as they wish!!!!!!!!!!!