Our records show that you have an outstanding balance dating back to January, 200-. Your January invoice was for $445.00 and we have yet to receive this payment. Please find a copy of the invoice enclosed.
If this amount has already been paid, please disregard this notice. Otherwise, please forward us the amount owed in full by March 1st, 20--. As our contract indicates, we begin charging 5% interest for any outstanding balances after 30 days.
Thank you in advance for your cooperation. We hope to continue doing business with you in the future