Who called from 2016215697

This number has called me non-stop today...12:28, 12:28 (no thats not a typo!!!), 12:57, 1:12, 1:26, 1:34, 1:35....I just answered it and it was some lady who kept saying "Hello..Hello........Hello", what is wrong with these people

this caller better stop calling me

Allegiance Telecom, Inc is the name of the company and i have yet to find a call back number for them or a do not call option

Repeated calls and hang up when I try to answer.

Got two calls from this number within 1 hour.  I called back this evening at 7:48 PM EDT - phone rang for about 2 minutes but no one answered.  The call finally disconnected and I got the sound of a busy signal.