Who called from 5126463830

No message left. No caller ID.  No answer here from another sorry stiff

Keep receiving calls from 512-646-3830 almost daily.  Caller I.D. shows "Direct Energy".  They never respond when I answer the telephone and finally added them to a block list on a home phone I specifically purchased for blocking callers like this.
I have no idea how legitimate the company is.  I just am old and got tired of being woken up by someone that never spoke.

Calls every afternoon.  When answered, no response.  Silence.  Very annoying.

Just recieved a call from this number. The call id only showed "Austin, TX". Nothing was said, only silence. I hung up and called the number. Oddly it rang, stopped ringing for a moment, rang again just a few times,then began to make a busy dial tone sound...?? What's really going on?

Keep receiving calls from the number. One call was at 12:52 am. No one on the other end of the line.