Receipts can explain a purchase, but they cannot force anyone to accept basic arithmetic.

One cashier used the register’s multiplication function to scan several identical products quickly during a busy shift.

A customer later misread two separate lines, insisted she had been overcharged, and rejected every patient explanation.

The numbers were not adding up for Karen.

It’s not my fault you couldn’t read the receipt….

At least 3 hours into my shift, I start serving a customer (let’s call her Karen).

In my store, we can type a number, press multiply, and scan one item so it comes through as whatever number is typed (e.g., if a customer wants four cans of beans, I would type ‘4x’ and then scan one of the cans). This is shown above the item I have scanned (e.g., if each can is 89p, it would read ‘4 @ 89p’).

This is important to the story.

Karen has a decent amount of items, so a couple of times I used the multiply method. Karen pays and walks away from the register, so I start serving the next customer.

Suddenly, the customer cuts back in.

As they leave, Karen cuts in and looks mad.

Karen: “You’ve charged me for 3 of these vinegars when I only bought 2.”

Me: “Can I take a look at your receipt?”

Karen shows me the receipt and points to ‘2 @ 99p’ for the oven cleaner, which is below this. I point this out to her.

She tried to explain what the receipt said, but the customer wouldn’t listen.

Karen: “You’re wrong. You’ve charged me for 3 and overcharged me. They were 49p, not 99p!”

Me: “Ma’am, the 2 thing isn’t for the vinegar, it’s for the oven cleaner. See?”

At this point, Karen keeps telling me I’m in the wrong. I also have a queue of customers lining up, a couple of them looking very baffled at Karen.

Karen then proceeds to blame me for her mistake. I gave her the correct answer, and she didn’t like it.

By the time the manager arrived, the customer had already left.

Me: “Would you like me to call a manager?”

Karen: “Yes, please!”

I then call a manager, but at that point, Karen’s gone.

She also told me that, apparently, “this” was the reason her son left the store. I’ve never seen this woman in my life, and I honestly doubt her son left here.

Wow! It seems like she finally figured it out.

Let’s see how the readers over at Reddit feel about this lady’s attitude.

People don’t always look at the total before jumping to conclusions.

This reader thinks they know which store she works at.

According to this person, customers need to improve their math and thinking skills.

If you enjoyed this story, check out this post about an employee who was passed over for a promotion, so got a job with the competition and quit immediately.

Here’s someone who would’ve passed the customer along to the service desk.

This cashier showed the customer exactly which receipt line belonged to the vinegar and which represented two bottles of oven cleaner.

Rather than acknowledge the mistake, the woman blamed the employee, requested a manager, and disappeared before one arrived.

She demanded accountability, then subtracted herself from the conversation.