A Woolworths customer who noticed an unusual charge on her shopping receipt has warned others to check if they too have been stung by an extra cost.

The woman said a staff member intentionally scanned a reusable bag that she brought from home at least three different times as she was checking out.

Taking to the company’s Facebook page to issue a complaint, she expressed her confusion as to how a wrinkled-up bag inside her handbag was mistaken for a brand new one.

“For the third time (that I am aware of) you have charged me 15 cents for my own bag,” the shopper wrote.

She said it was not about the money but made her question how many others had been charged.

The woman said that although she always keeps a reusable bag in her handbag, so she didn’t get “caught out”, the decision seems to have backfired due to careless staff members.

“Those bags are so neatly and tightly folded that it should be quite obvious to anyone that they have not just been picked up in store that day,” she wrote.

“The scrunched-up handles and few little tears are also a dead giveaway. Not to mention the fact that when I hand it over, I say, ‘Here’s my bag’.”

The woman advised others to “check your receipts” as she was certain that she wasn’t the only one hit with the charge.

“I’m not the only one this would be happening to. Shame on you Woolworths,” she said.

A spokesperson for Woolworths responded to the shopper saying it was an error on the staff member’s part, but that they “wouldn’t intentionally re-scan” the reusable bags.

“We’d be more than happy to fix it up next time you’re in store. We like seeing our customers bring their own bags and wouldn’t intentionally re-scan them,” said the representative.

“If you can please let us know the store visited, that would be appreciated, and we’ll ensure the feedback is forwarded to the store management team. We look forward to hearing from you and appreciate your understanding.”

This article originally appeared on Over60.