A Brazilian film with the same name
I was intrigued by this one because the title is the same of a film released in 2001, filmed in the city that I live, São Paulo: http://www.imdb.com/title/tt0303408/
Of course plot, setting and style are very different and I'm not inferring that the Belgian director has copied the Brazilian one (in fact, I doubt Provost has seen it), but there are some interesting similarities, since in the movie by Brant a man from a lower class also "invades" the lives of some richer people. It's a nice little thriller, which I recommend.
As a sidenote: my girlfriend wrote a film (http://www.imdb.com/title/tt5796726/) titled "The Invaders", also filmed in São Paulo, but it has a different theme.