Unhappy customer

I was traveling from South Korea and there was a 2 hours delay that resulted in me missing my connecting flight in Addis Ababa.i landed there at 7h30 and went to customer service, they changed my flight ticket to 15h30 and I was ok with that. I sat in the airport chairs from that time until 14h30 which was the boarding time. As I went to boarding gate, I was told that when I get to jhb, I would have to buy another ticket to Durban. But why because the delay was not my fault? The guy advised me to go to customer service and get this sorted, mind you people were boarding the flight. There was a long line and eventually, a guy who was supposed to help me was not even willing to listen to me, he told me that if I missed this flight , it was going to be my fault. But why did they not tell me in the morning when I arrived? Well, someone came because I was a bit angry, they spoke their language and I was told to wait aside, they will get me the next flight which was at 23h30. I was tired, my feet were swollen, I hadn't taken a shower since I left Korea the previous day. I had to ask them to give a food voucher because I was hungry, the guy directed me to the airport lounge. Why was I not directed to the lounge in the morning? The service I got from the customer service at 14h30 was horrible, the guy was even shouting at me. The lady at the reception was not friendly at all. I asked to take a shower and she just said "you can't "without any proper explanation. I insisted and she said she would ask her manager and told me to go and eat. I finished eating and went back to the reception and no one was there. I waited and the lady that came, said I could only take a shower at 7pm, we'll I had no choice but to wait. At 7pm I went to the shower room it was locked and the 2 gentleman who works there told me to come back at 21h00. I had no choice but to wait. I honestly felt like I was bothering everyone there, there were not helpful and not even friendly.