Respected sir/madam,
On behalf of ____________ (company name), I am writing this email in reference to the invoice no. _______ (invoice number) submitted to you on __/__/____ (date) against supply/ service of _______(product/service). I would like to bring to your notice that _______ (amount) is due and I request you to kindly complete the payment before __/__/____ (date) to avoid the late payment charges.
If you have any query regarding this matter, you can always reach our _________ (support) department at _________ (contact details). We are always happy to serve you.
Warm Regards,
____________ (Name),
____________ (Contact details)