In ancient Mesopotamia a merchant’s dishonesty led to a complaint nearly 3750 years old. Around 1750 BC in the city of Ur, a man named Nanni awaited copper ingots from a merchant named Ea-nasir but received substandard metal. His messenger was treated with disrespect and sent away empty-handed. In response, Nanni recorded his complaint in Akkadian cuneiform on a small clay tablet. He detailed the broken promise, demanded his money back, and warned he would shop elsewhere. The tablet is now in the British Museum and holds the title of the world’s oldest written customer complaint.