As you can see, this letter is written with the intent to get paid, but not at the expense of the customer relationship. Invoices go past due for many reasons, so you don’t want to jump to conclusions and start off with a harsh letter that may damage the relationship.
If the invoice continues to go unpaid, a collector should try again to call the customer and a second collection letter should be sent. The second letter will increase the pressure but must remain professional, a tough balancing act.