Harassment by callers from DMC

DMC is trying to get hold of my domestic worker. They are calling me and harassing me at my work and at my home. I get calls at 6 in the morning. The issue is nothing to do with me and I am really unhappy that they are calling me five or six times a week. I told Bulelwa today to stop calling me and give me the name of her supervisor so that I could stop this nonsense. She refused to give me the number and even said that I must tell her whether I know the woman that they are pursuing first before she would tell me. What right does she have to do that? This is harassment and I want it to stop.