Jingszo !

Almost 4,000 years ago, a Mesopotamian man named Nanni was so disappointed with the copper he bought from a trader named Ea-nāṣir, that he decided to write a formal complaint. Today, this Bronze Age clay tablet is the oldest customer complaint we know of – and it's a doozy.

Wasting no inch of his clay, Nanni's complaints cover both front and back of a small tablet measuring 11.6 by 5 centimeters (that's 4.6 by 2 inches). It was translated from its original Akkadian language by assyriologist Adolf Leo Oppenheim, and published in his 1967 book Letters from Mesopotamia.