Who called from 23456789

I continue to get phone calls that show on my caller ID as being from Salem OH with the number 2-345-6789.  They have even called in the middle of the night.  How can you block or report a number that is clearly not a real number?  I am on the do not call list for what good that does.

Got a call from 23456789 form Salem OH in the middle of the night.  I answered but no one responded, then they hung up.

it call me then hang up.

I got two calls on my land line from this number, one at 2:30am.  No one was on the line when I answered. Caller ID says "unavailable".

I RECEIVED A CALL FROM THIS NUMBER AT 3:48AM NO ONE WAS ON THE LINE BUT IT SCARED ME.