The oldest customer service complaint dates back to 1750 BCE, when a Babylonian merchant named Nanni wrote a letter to his supplier Ea-nasir, expressing his dissatisfaction with the quality of copper ingots he had received. Nanni accused Ea-nasir of breaking their contract and ignoring his repeated requests for a refund. The letter was inscribed on a clay tablet and found in the ruins of Ur, in modern-day Iraq.
