Who called from 5714477220

Woken by this 'crank' call that eventually started with singing of, "Hello, hello is anybody there .... etc."  If a real call, it was supposed to be from Alexandria, VA but could have been a 'faked' number.

Called 12.45pm. I stupidly answered and no one would talk on the other end. I said you called me and now you are blocked. Goodbye.