We are sorry to bring to your notice a bill of a paltry amount of Rs. _____________________on account of purchase of cloth made by you on ______________________. Because we are sure you have just forgotten, we know you won’t mind this friendly reminder. It is not a very large amount, and we are sure you will not delay it. If your cheque is already on the way to us, please treat this letter as cancelled and accept our sincerest apologies for an unnecessary wastage of your valuable time.
Assuring you of the best of our attention and cooperation.
Your Company Name