If the garnishee appears and answers and his or her disclosure is not satisfactory to the plaintiff, or if he or she fails to comply with the order of the court, by delivering the property and paying the money owing into court, or giving the undertaking required in section 25-1029, the plaintiff may file an application within twenty days for determination of the liability of the garnishee. The application may controvert the answer of the garnishee, or may allege facts showing the existence of indebtedness of the garnishee to the defendant or of the property and credits of the defendant in the hands of the garnishee. The answer of the garnishee, if one has been filed, and the application for determination of the liability of the garnishee shall constitute the pleadings upon which trial of the issue of the liability of the garnishee shall be had. If the plaintiff fails to file such application within twenty days, the garnishee shall be released and discharged.