Most local phone service providers will change your telephone number ONE time at no charge to you IF you are receiving harrassing calls AND IF you agree to having a non-published/unlisted number. The only problem with this is that you have to give your new number to everyone you want to be able to reach you. And, depending on who you give the number to the unwanted calls may begin again. I'm with you...the people calling are just doing their job, but the calls are unwanted and interrupt lives of those who they have no reason to call.
Keeps calling and doesn't leave message. It is a company called Recievables Performance Management. It appears to be a collection agency trying to collect very old debts that have already been taken care of. A very shady bunch. Almost 500 comlaints to the BBB in the last 3 years.