A man from Romans pizza, his name is Robert

A man from Romans pizza, his name is Robert. He came to my work place harassed me. I went to Romans to buy pizza and also ask him nicely to stop harassing me and he lashed out and told me to never come back in his shop but now as a buying customer I felt disrespected and I was called kafer. I even experienced him shouting at his workers beating them nd shouting at other customers. Pls help because now we no longer feel comfortable buying when he is around we would rather drive to another place than face him due to his attitude.