Step 1: visit https://www.amazon.com/hz/contact-us/foresight/hubgateway

Step 2: click ‘Help with something else’ button

Step 3: scroll down and click ‘Something else’ button

Step 4: click ‘I need more help’ button

Step 5: click ‘Continue previous chat’

Step 6: Just Scroll up and you will see previous chat history.
