Who called from 5712295651

This call came to my phone. I answered it and said Hello. The line was silent. I finally heard a click and the call was disconnected.

Please quit calling me. Take me off your list please. I will turn this number in to the phone company if you do not quit calling me.

Quit calling me.

I am called evey day at work and 4 times so far today.  No one is there and when I try to call back I get a recording that the number is not in servce, then a busy signal.  THIS MUST STOP.  TYING UP OUR OFFICE PHONE AND MY TIME IS WRONG.