The using agency is responsible for inspecting and accepting or rejecting deliveries. The using agency shall determine whether the quantity is as specified in the purchase order or contract and whether the quality conforms to the specifications referred to or included in the purchase order or contract. If inspection reveals that the delivery does not conform to the quantity or quality specified in the purchase order or contract, the using agency shall immediately notify the central purchasing office. The central purchasing office shall notify the vendor that the delivery has been rejected and shall order the vendor to promptly make a satisfactory replacement or supplementary delivery. In case the vendor fails to comply, the central purchasing office shall have no obligation to pay for the nonconforming items of tangible personal property. If the delivery does conform to the quantity and quality specified in the purchase order or contract, the using agency shall certify to the central purchasing office that delivery has been completed and is satisfactory.