Overcharge in an invoice
I am returning herewith your invoice No. 863 for amendment because you have charged Rs. 15/- per piece of woollen muffler while your price list quotes Rs. 11/12 for it.
Kindly send the amended invoice for payment.
Reply to above
Thank you for your letter dated The same invoice is being returned to you for payment because the muffler supplied to you is of a superior quality, as desired by you, than the one advertised in our price list.
Kindly send payment at an early date.