In reviewing our accounts receivables, I noticed that we have not received payment in the amount of $______ for invoice #_________, dated _________________.
I am sure this is just an oversight on your part. If, however, you have a problem with the service we have provided, please contact me immediately so we can discuss the matter.
If I do not hear from you, I will assume that you have no difficulty with the service or with paying the invoice and will look for payment by [date].
NOTE: This material is intended as only an example, which you may use in developing your own form. It is not considered legal advice and as always, you will need to do your own research to make your own conclusions with regard to the laws and ethical opinions of your jurisdiction. In no event will ISBA Mutual Insurance Company be liable for any direct, indirect, or consequential damages resulting from the use of this material.