Dear Mr. Ian,
I am afraid that we still have not received the receipt for our payment regarding invoice NO.00942926. Three months have passed since we made the payment in May.
This month, we will be closing our books for the year.
If the receipt is not sent by the end of the month, it will hold up our accounting procedures.
Please turn you attention to this problem at once, as I would not like to see something like this hinder our business relationship.