Re-read the last two paragraphs of my post. In communication like this offer an alternative. This is what you can do to make me happy. Make a realistic request (like a second sheet) and see how they respond.
If you display that kind of attitude the person behind the counter gets defensive and will often not be at a loss to satisfy your needs.
They made a mistake and help them put it right, not accuse them because then you don't get what you want.
If you follow my advice ( which is backed up by years of experience as well as tons of psychological data and studies) you get your needs filled and keep headaches to a minimum.
Or spew your venom, put them on the defensive, wracked with guilt and resentment and see how well your needs are met.