The Last Payment Is A Tax On Those Who Do Not Listen

I work at a debt collection agency. As part of the process, we send letters, including when an account is paid in full.

Debtor: “Yeah, I received a letter from you but this account is already paid!”

Me: “Okay, let’s take a look.”

Debtor: “This is utterly ridiculous; this account is paid!”

Me: “Okay, I do show the account is paid, as well, and we did send a letter to notify you of that on [day]. What’s the date on that letter?” 

Debtor: “[Same day].”

Me: “All right, so that’s the letter we sent for your records so you know the account has been marked paid. You’re all set with us!”

Debtor: “But the account is paid! Why did I get another letter?!”

Me: *Facepalm*