per D & B page:
If you have any additional questions or concerns, our Customer Service Center at 800-234-3867 is always ready to assist you and help authenticate our communications.
 Mar 21st, 2014
This is a Collection Agency - Dunn & Bradstreet. Their address is 400 Penn Center Blvd Pittsburgh, PA 15235. Their main office number is 412-829-3731, and their toll-free Customer Care line is 800-234-3867. They called me and hung up as soon as I answered the phone, and when I called back the 866 number that they called me from I got a recorded message that the number is no longer in service. Don't know what kind of game their playing.
 Apr 24th, 2007
The caller said they were with Dunn & Bradstreet. They gave me some information about my company and they said they wanted to update my file. I said I would call them back and the gave me 1-800-234-3867 as their #. I called the 800 # & it was Dunn & Bradstreet. They said they didn't need to update my file and I gave them the information above and told them that they should check it out.
 Mar 02nd, 2007
They called twice without leaving a message. They said that I did not need to worry that it was not a sales call. They are just gathering information for their data bank. I asked for a number to call them back. They gave me 800-234-3867. I called they insisting on me giving them my address (which the person who called had when they called 4 minutes earlier). He gave me an address which was not mine so that I may correct it. I did not correct it. I just requested that he removed my info from his list. I am on a do not call list and I will report him to better business bureau. When I called 307-726-3100-there was an answering machine that said that they did not make calls from this number and a disclaimer for all sales or information gathering calls. I could not leave a message either. Something very weird is going on.
 Nov 14th, 2006