(1) The owner of any petroleum, or his agent, who is dissatisfied with the result of the test of the petroleum may, within seven days from the date on which he received intimation of the result of the test, apply to the officer empowered under section 14 to have fresh samples of the petroleum taken and tested.
     (2) On such application and on payment of the prescribed fee, fresh samples of the petroleum shall be taken in the presence of such owner or agent or person deputed by him, and shall be tested in the presence of such owner or agent or person deputed by him.
     (3) If, on such re-test, it appears that the original test was erroneous the testing officer shall cancel the original certificate granted under section 19, shall make out a fresh certificate, and shall furnish the owner of the petroleum, or his agent, with a certified copy thereof, free of charge.