Dear …
RE: Account - __(Reference name & number)__
Upon review of our records, we note that the balance currently owing on your account is __($amount)__. Enclosed, you will find a Statement of Account outlining the details of your account transactions. We ask you to remit this balance due as soon as possible to bring your account current with us. If you have already forwarded payment, please ignore this letter and accept our thanks.
Please don’t hesitate to contact me directly at __(phone #)__ if you have any questions about your account. We thank you for your valued business, __(name)__, and hope to hear from you soon.
Regards,