If you receive demands for payment, it usually means there is a remaining balance on your account. This may be because your finance department has paid the wrong amount or in the wrong currency, or because you have raised a PO and then later made an additional purchase which the PO did not cover. In this case it is not unusual for finance departments to only pay the amount in the initial PO. Your finance department may also have failed to take into account bank charges or used an incorrect exchange rate, leading to us receiving less funds into our account than are on the invoice. In all these circumstances please contact us and we will investigate the reason for the remaining balance.