The worst I have experienced is from the Duke MBA program. I took the GMAT which is where they got my email from... now I get 3 emails a week despite completin

The worst I have experienced is from the Duke MBA program. I took the GMAT which is where they got my email from... now I get 3 emails a week despite completing the MBA at another school over a year ago. Their emails do not have an unsubscribe. I tried responding and requesting to be taken off the list... nothing. I even tried calling but their office appears to be open only between the hours of 2:30 - 3:30 EST. I have marked it as spam but every once in a while they change up the email and it sneaks through. It's incredibly annoying but a bit funny at the same time.