As explained in the section ‘victim of a crime’, if the prosecutor has decided not to prosecute, the injured party is entitled to bring a charge for the offence him or herself and thus have the case considered by a court of law.
The decision not to prosecute is also open to complaint to the Prosecutor General, who is competent to take the case upon him or herself for a fresh consideration. A complaint can also be filed if the conduct of the prosecutor otherwise gives rise to dissatisfaction.
About 400 complaints are filed per year. Only about 20 of them, however, result in a charge being brought in the case. Depending on the nature of the matter, the complaint may also result in the prosecutor being reprimanded or in some other less severe consequence.
You can read more about the complaints procedure on the Office of the Prosecutor General’s website.