Unprofessional, uncouth, disgusting manager and staff

A disgusting experience here. A group of friends (tourists) decided to end a memorable trip to Cape Town with a lovely dinner. We chose The Wild Fig Restaurant. Everyone in the team are professionals, all being doctors. When one of the friends went in first the waitress mocked him and said Ching Chong Chinaman. He is of Chinese descent. This was horrifying. Being appalled by it, they asked for the manager. The rude manager dismissed it and said they misunderstood her and defended her. They also insulted the whole group. They didn't talk in the office. They were talking in the corridor. Then the insult went even further. They said the two people who had complained were making too much noise and customers were complaining about them!!! This is abusive and ******. Can someone please take this seriously and can someone attend to it urgently. They said these workers are there for many years. It was an absolute insult and disgusting to be treated in this manner.