Explanation:
The complaint tablet to Ea-nāṣir is a clay tablet that was sent to the ancient city-state Ur. Written c. 1750 BC. in Akkadian cuneiform, it is recognized as the “Oldest Customer Complaint”.
The tablet details that Ea-nāṣir travelled to Dilmun to buy copper and returned to sell it in Mesopotamia. On one particular occasion, he had agreed to sell copper ingots to Nanni. Nanni sent his servant with the money to complete the transaction. The copper was considered by Nanni to be sub-standard and was not accepted.
In response, Nanni produced the cuneiform letter for delivery to Ea-nāṣir. Inscribed on it is a complaint to Ea-nāṣir about a copper delivery of the incorrect grade and issues with another delivery. Nanni also complained that his servant (who handled the transaction) had been treated rudely. He stated that, at the time of writing, he had not accepted the copper, but had paid for it.
https://en.wikipedia.org/wiki/Complaint_tablet_to_Ea-n%C4%81%E1%B9%A3ir
Kings and queens, proclaimed children of gods, have been forgotten. But not a copper merchant and his low quality product.