Treated bad at Nando's cause im white?

Disgusted in how my son and i were treated at your Umbogintwini Nando's. We have been buying at this Nando's since its opening and go there almost every week sometimes 2-3 times a week with 2-5 people every time. Most of the staff know us and we have enjoyed our meals there. HOWEVER This past Saturday night we entered your doors at about 8.50pm. There were still 4-5 cars in the drive through. We entered with another African Gentlemen and your Covid official welcomed us and we stood in line allowing the African gentlemen to place his order first. there were 2 - 3 other customers inside as well. The gentlemen was taking long to place his order. When we finally were able to place an order the teller shook her head walked off and was saying something to the other staff. The manager came to us and said sorry they are closed now. The manager was looking away when telling me so i asked him politely to look at me when he talks as i cant hear what he is saying through his mask. I explained to him we were waiting in line and its not our fault the gentlemen before us took so long and that we were inside long before 9pm. I asked for the owners number as he was getting very arrogant saying that he is in charge and he makes the calls not me. he said he was the owner I tried to explain no i want to talk to his boss as i am not happy with the way we being treated being regular customers, and that if there was a time problem they should have stopped us from coming in but then why did they take the African gentlemen's order. We were asked to leave while there were still customers inside. Going outside there were still people in the drive through lanes waiting for their orders. Another African gentlemen went inside as when we got to our car to pay for his order and collect. I am disgusted in the way we were treated maybe because we were the only white customers there and the staff was being friendly and assisting their own kind?