In case any person engaged in the business described by §23-1 shall refuse or fail or neglect to furnish or file a report pursuant to §23-5 at the time specified or shall refuse to permit the City, through its officers, agents, or representatives, to inspect the business books and records for the purpose of verifying any such report, then the occupation tax levied pursuant to this article for the preceding month shall be the sum of three thousand five hundred dollars, which amount shall draw interest at the rate of one percent per month after becoming due and payable, and in addition thereto a penalty of five percent shall be added for failure to pay such tax within six months.