A match fixed in La Liga?

Last Wednesday, Sevilla FC and Cadiz faced each other on the 36th day of La Liga. The Andalusians lost in the final moments of the match (see summary). This match restarts the race to remain in La Liga. In fact, the media reports that Rayo Vallecano, also involved in the fight to save itself, filed a complaint with La Liga about the match that Cádiz won.