Number calls, and because my phone rejects callers not identified, it cuts them off.  It's very annoying, but i'd rather not hear from them at all.

I also received calls from this number. Very annoying but I don't pick up. I think it's a scam.

This IS a scam.  They call my work number and leave a voice message that says "This is the last attempt we will make to contact you about your student loan."  Well... 1) I have no student loan  2) It is illegal to call my work number about any loans.  If you press 1 you get someone who is clearly in their home.  They will ask you what you are calling about.  So, it is clearly a robo call scammer for multiple things.  I asked to be taken off their calling list and they hang up on me.  This has happened numerous times.

Called offering school loan consolidation or refinancing or something.

Calls and it comes up on caller ID as SL Helpdesk. I haven't had a student loan since grad school...44years ago!!!!! Best to block them as they aren't responsive to telling them to take you off their list...They are bottom feeders!!!!!