Who called from 5137252099

Got called in the middle of classes. Didn't last long. Hung up before I could even pick up.

Called and hung up before I could even try to answer.  Tired of the B/S calls - probably had to do with my credit card which I do not have

Picked up phone and heard, "We're sorry but that is not a valid extension" and the caller hung up. I didn't call them, they called me. I wonder if this is going to make it seem as though I made a call to them and now have a business relationship so they can keep calling.

Not even one ring before they hung up. As a general rule, all unknown calls go to my voicemail.

Less than one ring.  No chance to answer, no message.
Must be scam.  Will block number.