It is actually a way of appeal submitted by sellers when they encounter problems on the Amazon platform. In other words, email is what is often called a case, and each problem will become an independent case and even an open case.

It is to report the [case] you encountered to Amazon so that the case can be solved with the help of Amazon's official power. Obviously, [case] means [problem], and [open] can be understood as [report], [public], [list], etc.

Amazon case is actually a chat with customer service. If you encounter any problems during store operation, communicate with Amazon customer service.