Who called from 7812341200

Got two calls during school, within a couple of seconds from each other. I didn't pick up, but when I tried to call later nobody would pick up either.

Said hello and no one answered.  Tried to call it back but was unable to.  Would not go thru.

Got a call from a doctor's office in Newton, MA from 781-234-1200.
Called twice today; I missed the first and answered the second.  They were asking if I could take an appointment tomorrow rather than in a few weeks.  Seems to be on the up and up...

Number called me twice today 3 secs between calls, no voicemail left, called it back and it was a "non working number"

This is a generic number for Spaulding Rehabilitation Center in Wellesley, MA.