Credit and discount
We beg to bring to your notice that we give discount to those of our customers who settle their accounts with us at three months. Perhaps, you are not aware of this rule. By delaying your payment you are liable to lose on discounts. But we are giving you a special concession this time. In future, however, we hope you would stick to the limit of three months.
Thanking you for your co-operation.
Reply to above
I have noted your instructions regarding payment of bills within three months, and follow them in future.