This Letter is to inform you about your ____ number of unpaid installments for an amount of ______ that has not been paid either on or before the due date.
We would also like to inform you of our previous letter of reminder regarding the same, that clearly mentioned that the matter would be referred to our legal representatives in an event of missed payment.
The company would like that you give this matter your prompt attention.
We look forward to receiving your payment no longer than _____ Date.
Your Name __________
Your Title __________