Missed wedding due to bad online service. ESN8YU

Not even sure why I should give a star. I did a booking as well as the online check in way before the departure. The message I received was that I would receive a boarding pass via whatsapp (never received). When I then arrived at OR Thambo I did a 2nd check in by the self service desk just to make sure seeing as I still don't have my pass. Later I went to the boarding section where I was told I need to go to the service desk. Which I did. At about 6:40. After waiting for my turn I got to the front of the que and was told to go to counter B128 and was told sorry you missed your flight. I then said I want to speak to the manager. Which again I did and again was told sorry you missed your flight and need to rebook a flight. Now I'm sorry but on principal your online system messed up and you as a company should assist a client. Thank you for no service and me missing a dear friend wedding.