We have received calls from this number over several days.  Sometimes we answer and after awhile they pick up, first a sales call and then they said something about a survey.....I "screamed" do not call this number multiple times, hung up and then lo and behold, they called again 30 minutes later.  No one was there.  We are on the do not call list, but list number has been the biggest pain in a long time!  Wish I knew how to get them sanctioned.