S. 69C: Unexplained expenditure -Unexplained expenditure – Bogus purchases – Sales accepted and books of account not rejected under section 145(3) –Furnished books of account, purchase invoices, payment details through banking channels and other supporting evidence – Addition based merely on non-response of suppliers to notices under section 133(6) and cancellation of GST registrations – Once corresponding sales were accepted, purchases could not be disbelieved or disallowed in entirety – Finding of Tribunal based on appreciation of evidence was a finding of fact – No substantial question of law arose – Revenue’s appeal dismissed. [S. 69A, 69C, 115BBE, 133(6), 145(3), 260A.]