The Registrar may, by summons under his or her hand in the form in Schedule 18 to this Act, require the proprietor or mortgagee or other person interested in any land under the operation of this Act, in respect of which any transfer, lease, mortgage or other dealing, or any discharge of any mortgage is proposed to be transacted or registered, to appear at a time and place to be appointed in the summons and give any explanation concerning such land or any document affecting the title to the land, and to produce any grant, final mailo certificate, certificate of title, will, mortgage or other instrument or document in his or her possession or within his or her control affecting the land or the title to the land; and the Registrar is authorised to examine upon oath, which oath he or she is hereby empowered to administer, any such proprietor, mortgagee or other person as aforesaid; and if any such proprietor, mortgagee or other person refuses or neglects to attend the Registrar for the purpose of being examined or to produce any such document or to allow it to be inspected or refuses or neglects to give any such explanation as aforesaid, and the information or document withheld appears to the Registrar to be material, the Registrar shall not be bound to proceed with the transaction.