Upon receipt of such application, accompanied by the sum shown therein, the probate judge shall give it a serial number and mark it filed, showing the date received. The judge shall make a notation on the face of the application and on the record of the instrument described in the application showing the date of payment, amount of tax paid and the serial number of the application. After such notation is made, the original application shall be returned to the applicant by mailing it to him at the address shown on the application or delivered otherwise to the applicant; the first copy of the application shall be retained by the judge as his permanent record, and the second copy of the application, together with a certificate of the amount of taxes paid thereon, shall be sent by the judge to the tax assessor of the county.

If it later is ascertained that an insufficient amount was paid with the application for the exemption provided herein, such exemption shall not be thereby rendered void, but the additional amount which should have been paid, together with a penalty of 25 percent and one percent interest per month thereon from the date of the application until paid shall be a lien on the interest exempted and a personal debt of the applicant collectible by civil action for appropriate personal judgment and to enforce the lien, which may be maintained by the county to which such sum should have been paid.