Captivity (2007)

A fashion model is drugged and abducted, waking in a sadistic underground prison where she is subjected to psychological torment and violent traps. Captivity blends the mid-2000s wave of “torture porn” horror with psychological breakdown, making it one of the controversial exploitation entries of the era.

Från IMDB:
A man and a woman awaken to find themselves trapped in a cellar. As their kidnapper drives them mad, the truth about their horrific abduction is revealed.