13.1 The certificate of EXIM BANK certified by any officer, as to what at any time are the appropriate amounts of profit, Compensation for Late Payment, and / or any other cost, charge, Commission(s), expenses or other money payable hereunder by the CUSTOMER and / or the amount of profit, Compensation for Late Payment, Commission(s), bank charges, and / or other cost, charge, fee expenses or other money chargeable and / or the manner of calculation and / or the time for payment of the profit, Compensation for Late Payment, commission, bank charges and/or other cost, charge, fee, expenses or other money shall be final and conclusive and binding on the CUSTOMER and shall 26 not, in the absence of manifest error, be questioned on any account whatsoever. Plaintif, melalui pegawainya yang telah diberi kuasa, telah mengesahkan dalam Sijil Keberhutangan bahawa setakat 31 Disember 2017, amaun keberhutangan Defendan adalah USD 17,529,463.51. [24] Defendan mempertikaikan kesahihan Sijil Keberhutangan tersebut atas alasan berikut –