Stop harassing me, I am not the correct contact

Please help, Homechoice phones me every day looking for my domestic worker as she has a loan outstanding. 12 times over I have explained that they have the incorrect number as I am the employer. The daily phone calls continue so I have passed on my domestic workers number to two separate agents and have messaged my domestic asking her to pay her instalment. The daily phone calls have continued. This daily harassment has to stop! Who do I speak to, as the agents who call say they will update their records but clearly this is making zero difference. Working in a call centre environment, I can't imagine how much money HomeChoice is wasting paying agents to call numbers daily knowing that the result is always the incorrect contact.