I'm a Stanford Alum, too. I've received a call from this number once per day for a few days now. Just a guess here, but I'd say someone outside of Stanford got a hold of a Stanford calling list and is using it illegally. Just don't answer it.
The phone number is for the student calling center for the Stanford Fund for Undergraduate Education. I just called the number and listened to the recording. You can always give us a call to update your information or access your online profile to make changes. We can also add special handling on your information, to not solicit by phone if this is something you would like us to do for you.