Bad Service

Recently I traveled from Lanseria to Durban with my family. Booked and paid for specific 5 seats (which were in Row 18) upon checking in we were allocated to Row 5 and I was told that that's the seats we were allocated to and no one bothered to communicate prior the date of departure, to atleast explain why? Since we were on a holiday, I didn't want to cause a scene in front of my kids or affect the mood, I just requested for contact details for their refund's department. I've been following up with emails and calls and no one is getting back to me, they just said they a investigating. I raised this issue on the 19th October 2019. I am not happy with this Airlines, their services is bad. They are so ***********.