I have received multiple calls from this number as well, however, today i decided to call them back as they have never left a message. The recording says that "they" purchase business listings and that they are sorry if they reached my number in error. After that i was given the option to press "1" and have my number removed from their list. I hope this helps us all.
They keep calling me as well. 3 times in one day. The call display said they were from the "District of Columbia" and I live in British Columbia, Canada. I also get calls from Maryland, New York and Virginia quite often. Wierd.