thriller

Help! Saw this movie on a plane few years ago and cannot find it. The plot: young banker or accountant is asked to fill in for more senior while he goes on vacation.  Starts getting calls about hooking up with accomplished executive women for sex. The one of his hookups is supposedly kidnapped; but it's an extortion scheme. He ends up turning the tables on the bad guys. What a twisted thriller. Any ideas? it's either English or German. Thanks