Second reminder for unpaid outstanding invoice after the provision of goods and services that have been overdue. Less polite than first reminder.
We are writing to contact you once again relating to Invoice Number for goods / services. As at today's date, we have yet to receive the payment of the outstanding amount of amount, which is now considerably overdue.
We wish to highlight the immediate urgency of this issue, as our payment terms dictate that a charge of [charge] be levied against late payment. Further late charges may be levied against you if you do not pay within [number] days.