¹[83. (1) Where a return or revised return has been filed under Chapter VIII and the Deputy Commissioner of Taxes is not satisfied without requiring the presence of the person who filed the return or the production of evidence that the return is correct and complete, he shall serve on such person a notice requiring him, on a date to be therein specified, to appear before the Deputy Commissioner of Taxes, or to produce or cause to be produced before him or at his office, any evidence in support of the return. (2) The Deputy Commissioner of Taxes shall, after hearing the person appearing, or considering the evidence produced in pursuance of the notice under sub-section (1) and also considering such other evidence, if any, as he may require on specified points, by an order in writing assess, within thirty days after the completion of the hearing or consideration, as the case may be, the total income of the assessee and determine the sum payable by him on the basis of such assessment, and communicate the order to the assessee within thirty days next following.]