I once had a neighbor in severe debt and the agencies were calling me and a few others listed in the proximity of their address. It was at all hours of the day, sometimes several times a day. Even had a guy ask me to keep the line open while I went to the person's house to ask them to come to the phone. I had just jumped out of the shower at the time to answer the phone. I asked to speak to the caller's Supvr who was willing to explain their process and they did use Intellus. Needless to say I went unlisted and told them not to call me again.
These calls are recorded so if you tell them to stop calling, they have to otherwise it is harassment, a.k.a. CHA CHING! and make sure you tell them you will take action if their calls do not stop. Would also help to log the person's name and time of call too.