You just have to call them back. It's a number belonging to Everest College. When you call them back, they will (automated) ask you if you would not like to recieve future calls, to enter in your phone number and press pound.
the IT chat person took my info Tuesday and said the calls would stop but they haven't. I'm sitting in a testimony seat all week at a federal regulatory meeting, I need the phone on for work reasons and the damned college won't stop calling!
Here's what I did:
I added their number to my contact, naming it "DON'T PICK UP", then change their ringtone to silent. So whenever I get a call, I won't hear it. After a few weeks, they literally gave up because I never answer them.