If a certificate of compliance from the director required by section 46-3 is not filed with the director or if it is revoked or canceled, a certificate previously issued or if the director finds that a particular slaughterhouse is not or is no longer in compliance with the provisions of this chapter, then the director shall refuse to issue a license to such slaughterhouse or shall refuse to renew the same or shall revoke the same, as the case may be; provided, that the director shall first give the applicant or licensee an opportunity for hearing upon not less than ten (10) days' notice, at which the applicant or licensee shall have the opportunity to show cause why his application or license should not be denied, canceled or revoked. If the applicant or licensee shall fail to appear at the time and lace set for the hearing, the director shall refuse to issue or renew the license or shall revoke the same, as the case may be. All action taken by the director pursuant to this section shall be by written notice sent by registered mail to the applicant or licensee at his last-known address as the same appears in the records of the director. (Mont. Co. Code 1965, § 101-4; 1972 L.M.C., ch. 16, § 13; 1980 L.M.C., ch. 38, § 1.)