shall be held responsible and pay for any shortfall, defect, damage or deficiency in property or performance of the Services. In such case, the Contractor shall refund to the Company the price payment for the Services it received from the Company in respect of such Services within 15 (fifteen) days from the date the Company advised the Contractor thereabout. If the Contractor fails to reimburse the payment within this period, the Contractor shall pay interest together with the money to be refunded to the Company at the rate of 15 (fifteen) percent per annum that shall accrue as from the day following the lapse of said 15 (fifteen) days period until the refund amount is paid in full.