All common carriers doing business in this State shall settle their freight charges according to the rate stipulated in the bill of lading if the rate therein stipulated be in conformity with the classifications and rates made and filed with the Interstate Commerce Commission, in case of shipments from without this State, and with those of the Public Service Commission and the Office of Regulatory Staff, in case of shipments wholly within this State, by which classifications and rates all consignees shall in all cases be entitled to settle freight charges with such carriers.