Who called from 5128067723

Automated call.I answered. Then it hung up.

I called the number back and got this automated message:
"Thank you for calling.  To be removed from our call list, press 1."

I received a phone call from this number on July 13, 2015, at 3:12 PM and the Caller ID was "Unknown Name."  I answered and said, "Hello" several times, but there was no one at the other end.

They called on July 13, 2015 at 3:31 pm soliciting energy conservation upgrade programs. I asked where they got my number. They said public record from utility companies in Texas. I asked why they don't cross check their numbers with the federal do not call list. They said not all numbers were compatible with the list. (???) Both caller and supervisor were rude, talked over me, etc.

Called at 7:53 pm.  I answered because it was a local number.  They hung up.  Now blocked.