This caller who uses multi telephone numbers including spoof numbers has lots of time to waste it would appear. They don't even know who they are calling most of the time. I have a phone that can block unwanted callers and that is what I do with any unknown phone number not having a valid caller ID or leaving a message. These kind of calls and the people making them should be illegal. Many of these calls are just scams, or harassment. If these callers are legitimate bill collectors, then they should go through the court system legally or get lost.