Recvd call from this twice since yesterday afternoon.  Decided to answer it the 2nd time.  Caller says nothing, and when I asked "is anyone there?", they hung up.  Called it back, a recording thanks you for calling back, no identification as to who they are, and it continues to say that if you recvd this call in error, press 2 to be removed from their list, but when you do, it just repeats itself.  Same thing last nite when I called them back (blocked my caller ID).  I just blocked their #, seems the only way to stop this caller.