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Dear Mrs. X,
We would like to bring to your attention that payment regarding invoice number: (XU-204850) is now overdue.
We would like to remind you that our company policy is to provide our clients with (x days/x weeks etc.) after the last billing date to successfully complete a payment on time.
Our records show that your last payment is now (X days/months) overdue; we would therefore kindly request and appreciate for this payment to be made as soon as possible.
Please do not hesitate to contact our customer service department should you have any questions or require further assistance with this matter.
(name + Job position/title)