(2)No person shall occupy or permit to be occupied any such building or use or permit to be used any building or any part thereof affected by any such work until permission has been granted by the Municipality in this behalf in accordance with the rules and the regulations made under this Act:Provided that if the Municipality fails, within a period of thirty days of receipt of the notice of completion, to communicate its refusal to grant such permission, [such person may make a representation in writing to the Chairman, and the Chairman shall, after such inquiry as he may think fit and after giving such person an opportunity of being heard, grant such permission, or communicate his refusal to grant such permission stating the reasons therefor, within a period of thirty days from the date of receipt of the representation as aforesaid failing which] [Inserted by section 30 of the West Bengal Act 16 of 2002, w.e.f. 2.9.2002.] such permission shall be deemed to have been granted.