Have to delete the save data or complete it and it'll start over from the beginning.
It is completable even if you're at the looping segment.
1) Loop the segment so you start fresh/reset bell.
2) Go to phone and point camera at it (don't need to R3)
3) Soon as the bell starts to chime, play this video's audio into your mic (Make damn certain your mic is switch to the ON position!):
https://www.youtube.com/watch?v=n3Jwm5jsoWU
4) Keep playing it until you get baby giggle.
5) Soon as you get 1st giggle, turn to entrance and take 10 steps to force 2nd baby giggle.
6) Don't move yourself with the controller and just wait until it starts vibrating. Once vibrating keep waiting, don't move and you'll get 3rd baby giggle
7) Phone rings, go to it and R3 the phone until you hear "You've been chosen!"
8) Go to garage door (down the steps) and voila, end!