World's first angry customer: A 4,000-year-old clay tablet is believed to record the world's oldest known customer complaint from ancient Mesopotamia. A customer named Nanni complained to the merchant Ea-nāṣir about receiving inferior-quality copper and the disrespectful treatment of his representatives. The formal commercial dispute highlights that concerns over product quality, customer rights and business accountability existed thousands of years ago. Historians say writing in Mesopotamia initially evolved for administrative and commercial purposes, including recording trade and transactions.

Today, a dissatisfied customer would probably leave a one-star review, send an email complaint, or post on social media. In fact, almost 4,000 years ago, one Mesopotamian client…

World's first angry customer: A 4,000-year-old clay tablet is believed to record the world's oldest known customer complaint from ancient Mesopotamia. A customer named Nanni…