GST Assessment proceedings, etc. not to be invalid on certain grounds

(1) No assessment, re-assessment, adjudication, review, revision, appeal, rectification, notice, summons or other proceedings done, accepted, made, issued, initiated, or purported to have been done, accepted, made, issued, initiated in pursuance of any of the provisions of the Act shall be invalid or deemed to be invalid merely by reason of any mistake, defect or omission therein, if such assessment, re-assessment, adjudication, review, revision, appeal, rectification, notice, summons or other proceedings is/are in substance and effect in conformity with or according to the intents, purposes and requirements of the Act or any earlier law. (2) The service of any notice, order or communication shall not be called in question if the notice, order or communication, as the case may be, has already been acted upon by the person to whom it is issued or where such service has not been called in question at or in the earliest proceedings commenced, continued or finalised pursuant to such notice, order or communication.