Horrific First Experience With Kulula

I purchased a ticket from Durban to Lanseria on the 22 June 2018 , departure time being 19:45. This being my first flight was excited but nervous. I arrived at the check in line at 19:00 and there was a white couple in front of which had the same departure time as me that successful got checked in. I was then attended to at 19:05 at counter 3 and the personal attending to me stated that I needed to check in at 19: 00 and he couldn't assist me. I explained to him that is was important I board my flight and I was well within time as my departure time was 19:45. He called someone on his radio intercom and casual stated there was nothing he could do about it as I should have checked in at 19:00 , I must attend to the check-in help desk. Kindly note this is my first flight and was unaware that by him directing me to the check-in help desk was only making certain I don't board my flight. I then stood in other line and by the time I received assistance it was 19:30 and they stated they couldnt assist me and further to that as it was school holidays there are no flights available to Lanseria till Monday morning. Please note everyone is extremely casual about them not assisting me with boarding my flight and stated I can collect R50 /R100 with my refers being ********** ********** . Kindly note if there was no waiting period in the line I would be on time, the worst feeling was that the couple before me were allowed to board the same flight , same time as me but I guess my skin colour wasn't right. Please further note Kulula no where on your ticket issued reflects the check in time being 19:00. Thank you for the aweful experience.