(1) The order on hearing has been mailed or delivered to the persons entitled to receive the same;
(2) The Commissioner's order denying rehearing or reargument has been so mailed or delivered;
(3) The Commissioner has refused or failed to make his order on hearing as required under Code Section 33-2-23; or
(4) The Commissioner has refused or failed to grant or hold a hearing as required under Code Section 33-2-17.