I had a caller once who called in looking for a discount (of course) because, after all, he had paid all of his bills on time! Mind you, he had been with us for about four months and had not paid any of those bills on time, except the payment to start the account (you can’t start an account without making a down payment). He thought that paying on our late notices counted as on time.
I had to find a nice way to explain to this grown adult that, no, you haven’t paid your bills on time, and also, hey, you’re just supposed to pay the bill! You don’t get a special award for doing this thing you’re supposed to do anyway! He wasn’t pleased.