The Sweet Sound of Death
La llamada (original)
Pablo is in love with Dominique, whom he wants to marry. The girl leads them to a cemetery, where she convinces Pablo that should either of them die, the other will return and help them prepare for the afterlife. She leaves Madrid on a vacation in Bretagna, and dies en route. Pablo receives a call the next day. It is Dominique.
Starring Emilio Gutiérrez Caba, Carlos Lemos, Dyanik Zurakowska, Tota Alba, Paco Morán, Sun de Sanders, Víctor Israel, Ana Godoy
Watch "The Sweet Sound of Death" from streaming services Amazon Prime, Amazon released in 1965. It's a horror and drama movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.