I was on my other business line when our office recieved a call.  I was unable to answer, so it rolled to voicemail and they left no message.  I dialed the number back, as per our office eitquette, and it gave me the option to give our ten digit telephone number and have it removed from their list.  I did so, expecting to hear the company name at the end of the call, as usual.  There was no company name, and after you submit your request, it thanks you and the line is automatically disconnected.