Remarks?

     If the following events happened frequently, I'd question my mental facilties. But as they have only occured  three times over 27 years; perhaps some other factor is at play.  Twice, while alone in the house, I have heard my name called quite distinctly. The sound came from the room I was in; not from far away, such as someone hailing me from another part of the house. Both times I answered thinking someone had entered the room; before quickly realising no one else was in the house, much less the room I was in.. The other time was a phrase. Again, I was alone in the house, I was on the second floor, when out of nowhere a voice said,"I am not allowed to help you". Help me what? Again a mystery..