Odd UNSCHEDULED visit on a Saturday from AT & T Rep.

This past Saturday the 10th of October, we were paid a visit at our Townhome in San Diego at about 1:00 P.M. This visit was unannounced and unscheduled.  The young man was simply wearing an AT & T Light Blue Shirt, and had a clipboard where he was making notes.  He was NOT wearing an identifying badge and simply asked, "Hi, I'm here from AT & T and would like to know how your AT & T Internet working?"  I answered no problem and quickly shut my door (as I had my dog going crazy barking at him).

Does AT & T practice making these unannounced "service calls" randomly?  Are identifiable badges not required?  Wearing a light blue AT & T shirt simply is not enough identification.