Which ancient civilization established the first known formal customer complaint system with official records of disputes and resolutions?

While modern retail uses sophisticated systems to track customer satisfaction, ancient civilizations had their own methods of ensuring customer loyalty and resolving disputes. These early forms of 'customer service' were crucial for marketplace reputation and commercial success. Test your knowledge about how ancient merchants maintained their customer relationships and handled complaints in the earliest known retail environments.

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Mesopotamia (specifically Babylon under Hammurabi's Code)
Ancient Egypt under the New Kingdom pharaohs
Classical Athens during the Golden Age of Pericles
The Roman Republic's market aediles system