How to write a dunning letter?

XXXX，

Attached (or below) is the delivery list (statement) of our company this month, please check it. According to our agreement, this account is due on X. Please confirm the bill and arrange payment as soon as possible. If you have any questions, please contact. Failure to receive a reply within x days shall be regarded as confirmation of the proposal. The following is our account information. (If you need to issue an invoice, please provide us with the billing information. )

Then you make the statement clear, including time, quantity, amount, recipient, etc. Attach your account information. Finally, thank them for their work support!

Sign again and affix the official seal.

Of course, according to the relationship between your two companies, we need to polish the wording of the contact letter.