In all the anime and j-drama I have watched all these years, as far as I can remember, the only scenario where the greeting 「ごめんください」 is used is when the characters are in front of an ajar or open door of a house calling the residents out, like 「ごめんください! だれかいませんか?」. I also remember some scenes where this greeting was used in phone calls, although I can't recall whether it was in th…