Disappointed Loyal Customer

On Thursday the 4.01 I took a flight Fromm jHB OR tambo to DURBAN which was booked the day before as my mother is not well. I got to the airport on time and had checked my bags as well as received my boarding pass. So my bag was on the plane already!! Could not have been a no show!!!! I was flying with my two year old at 9:50am. We had left home quite early as we live very far from the airport so she was hungry and crying for something to eat. Went to get her food and then went back to the boarding gates. At security they held me up by about 8 mins as they have a new rule about prams that I was not aware of. I got to the boarding gates at 9:38 and the ladies at the gate refused to let me through to the plane as boarding had closed at 9:35. They were very rude about it even though I tried explaining why I was late which was security.. I missed the cut off by 3 mins. Then I had to go to back to ticket sales for assistance. Ticket sales advised that I needed to pay for a new ticket as I forfeit the other one due to the missed flight. Eventually after a lengthy conversation and tears a lovely lady by the name of Karabo and her supervisor helped me by just charging me a change fee for the tickets... they put me on a flight at 13:35.. when I went to check in I was advised that this flight was delayed by 45 mins.. so we would need to wait and boarding was at 13:45. We waited and waited as I did not want to be late again.. eventually at 2:10 we started boarding. This was done by 2:25. The pilot then announced his apology etc. we still waited until 2:50 before taking off as there were more people to boarding... so why is it that some people are allowed special treatment while others who were only 3 mins late were denied access to the plane had to practically purchase a new ticket and still wait at the airport for over 5 hours with a two year old.. mango has absolutely no compassion for their customers at all. They simply just have a no care attitude and cannot be bothered if you are a loyal customer or not.. I fly Mango regularly almost every two to three months... never have I felt so lost and helpless before... I will be cancelling my membership with them and rather fly Another airline that at least makes you feel good as a customer