we get these at work also---most will stop after you tell them you are not interested, but we have had a few that are really perisistant. If they call back more than twice, after being told that we are not interested then when I answer, I tell them that I wish to speak to a manager or supervisor---since they are being recorded, they have to get them or it could mean their job. I then tell the manager/super that we have told his company several times that we are not interested and to not call us again and since they will not listen, the next time they call, we will be filing harassment charges against them since we know who they are. Works everytime.