I was charged long distance for a call to this nimber I never called. It was a 33 minute charge. Who is this anyway?

Two phone calls to this number that I did not make in early March

This is a conference line.  People call it to talk to others, in distant places via a conference call line.  If this shows up on a telephone bill, you most likely participated in such a call.

Who is this caller?  I do not know any person living in this location.