If it appears to the probation department that the divertee is performing unsatisfactorily in the assigned program, or that the divertee is not benefiting from education, treatment or rehabilitation, or that the divertee is convicted of a misdemeanor in which force or violence is used, or if the divertee is convicted of a felony, after notice to the divertee, the court shall hold a hearing to determine whether the criminal proceedings should be reinstituted. If the court finds that the divertee is not performing satisfactorily in the assigned program, or that the divertee is not benefiting from diversion, or the court finds that the divertee has been convicted of a crime as indicated above, the criminal case shall be referred back to the court for resumption of the criminal proceedings. If the divertee has performed satisfactorily during the period of diversion, at the end of the period of diversion, the criminal charges shall be dismissed.