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Incident · 2026 · Retail (small business)

UK shop’s chatbot is talked into an 80% discount on an £8,000 order

In February 2026, a UK business owner posted that a customer spent about an hour flattering the shop’s after-hours chatbot, which was not meant to handle pricing, until it invented a 25% and then an 80% discount code. The customer placed an order of over £8,000, demanded the discount and threatened small-claims court.

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What happened

Per the owner’s Reddit post, the customer asked the chatbot to show how good it was at maths and percentages, then steered the conversation to discounts on a hypothetical order. The bot generated a fake 25% code, which the customer rejected, and then an 80% code.

The code failed at checkout, so the customer pasted it into the order comments and asked for it to be applied manually. When the owner moved to cancel, the customer threatened small-claims action with a three-day deadline.

What happened next

The business canceled and refunded the order. No discount was honored and no lawsuit has been reported.

What would have stopped it

  1. Do not let the chatbot create or state discount codes. Codes come only from the promotions system, and the bot can only look them up.
  2. Give the bot a fixed reply that it cannot change prices or offer discounts, and test that it holds after long, friendly conversations.
  3. Flag orders that cite a chatbot conversation in the comments for human review before fulfillment.

Sources

  1. Reddit r/LegalAdviceUK: the owner’s post
  2. Aardwolf Security: Customer talks AI chatbot into 80% discount
  3. Vibe Graveyard: UK chatbot 80% discount

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