Drextel university is the culprit behind this number.

This is the phone number for Drexel University.  All calls from the University that go to outside numbers will display 215-895-2000.  You could be receiving a call regarding an event reminder, status of your application, or anything else related to this University.  If you are a current student, or recently accepted to go to this school - answer the phone.  Drexel will leave you a voicemail if it was something important (unless your voicemail is full or your phone rings for more than a minute)

Source: current student and work in the admissions

There is absolutely no reason why they should be calling me, unless they dialed a wrong number.  I was called twice, withing 4 minutes, on 8/11/15.

I received a call from this number but couldn't answer. They didn't leave a message, but I think it was Drexel University.

Typically Drexel University's admission/enrollment team. This is the main switchboard though so any Drexel University number will route through this.