Who called from 2140000000

I am getting calls at home from 214 000 0000 on my home phone.  You cannot return the call.

Nuisance call on my cell please investigate

I am getting calls from 214-000-0000 night and day.  214 is the Dallas, TX area code.  They don't leave a message.  I Googled the number and many, many websites list it as their number, everything from the Dixie Chicks to just regular businesses.  I see one guy says it was Republicans calling trying to sell him on a candidate.  It's not listed in the reverse directory.  Extremely annoying.  It says it's a wrong number if you try to call it back.

They have called me twice, and I let machine get both times.  I am very surprised to hear they hang up if you answer.  What is this?

Its Wachovia, auto-dialing system.