Harassment for someone else’s debt

Daly Credit Corporation have been harassing me endlessly for the debt of someone else. They are constantly phoning me during work hours, looking for someone else. Every time they phoned, I tell them that they have the wrong number and that I cannot help them, I’ve told them plenty of times to please remove my contact details and to stop harassing me. Every time they tell me that they will remove my number, just to receive another call from them a few days after. I spoke to Alicia yesterday (at around 17:00) and she told me that she will speak to her supervisor to make sure no one phones me every again. Today at 12:00 they tried phoning me again, but I was unable to answer. I phoned back at 16:00 today to find out why they are still phoning me (thinking they want to apologize for all the harassment), but still, they are looking for the person whose debt they want to collect that I told them plenty of times I cannot help them. The gentleman said he’s going to remove my contact number and no one else will ever phone me again, hopefully this time their employee is talking the truth, unlike all the previous ones that constantly harassed me and told me they won’t phone again.