A law student is demanding a lifetime supply of KitKats after she bought a pack of the chocolate bars without any wafer.
Saima Ahmad, 20, a second-year law student at Kings College, London, is demanding Nestle compensate her with a lifetime supply of KitKats, or face her taking legal action.
Ms Ahmad wrote a letter to the manufacturer claiming "monetary and emotional" loss, quoting case law from the 1930s to back up her arguments.
She bought a multipack of eight KitKats from her local supermarket for £2 last month, but was disappointed when she bit into a solid bar of chocolate, ITV News reports.
"Clearly, if I wanted to purchase a confectionery item that is purely chocolate, I would have purchased a bar of Galaxy," she said.
"I wouldn't rule out taking this further if Nestle do not apologise or compensate me adequately."
However, she admitted she is "trying her luck," adding "if you don't ask you don't get".
An extract of her letter to Nestle reads: "The truth of the matter is; manufacturers owe a duty of care to consumers.
"The specific duty you owe in consistency in your manufacturing process. The failure to take due care in the manufacturing process resulted in a product being defective.
"As a result I feel as though I have been misled to part with my money and purchase a product that is clearly different from what has been marketed by Nestle.
"The loss I have suffered is of monetary and emotional significance."