How hard can it be?

I mean I must be missing something.
My wife had to drop off some prescriptions. She went to one of the big box stores around lunch and asked if she could wait. She was told it would take a couple of hours since it was just a couple of days after thanksgiving and they were swamped with new prescriptions.
Ok I can kind of understand that, but if a customer is going to wait, wouldn’t good customer service dictate that you help them first? So, she decided to leave them and come back the next day.
Fast forward 26 hours. She goes back. And was told it would be about 15 minutes. She goes back to the counter. “Just a little while longer.” So after playing this fun little game for 2 hours she finally complains. “Well, we are busy.” “But, you said if I dropped them off yesterday, they would be ready today. That was 24 hours ago.” “We aren’t a 24 hour store.” “What does that matter. You still had like eight business hours.” “No, you dropped them off after 5pm.” “No, I dropped them of at noon.” Then the girl at the counter rolled her eyes and scoffed.
At this point, I pause to tell you how I would have handled it. I would have said “Excuse me but how hard is it to reach up on to a shelf, grab the jar of pills, count out 20 of them, pour them in to a bottle, and print the corresponding label? I want to talk to your boss. Today is what a Tuesday? That’s all it is for me, but for you this is the most important day of your year.
I would have proceeded to get another notch on my belt. I would not have left the store until she was fired. But then again I am a duck, and I try not to let things affect me.