What is the oldest written complaint?

The complaint tablet to Ea-nasir was a clay tablet written in Akkadian cuneiform is considered the oldest written complaint. This tablet was written in ancient Ur in the year 1750 BCE. This tablet can be currently seen in the British Museum and has become famous in modern times by being the subject of an Internet Meme. The subject of the complaint is substandard copper ingots being sold by Ea-nasir to Nanni. Nanni sent is servant with money to complete the sale, however on arrival the copper was considered substandard and was not accepted. The complaint also states that Nanni's servant was treated rudely.