Just one data point but, sending Bezos a nice hello and airing my grievances has worked for me every single time.

Obviously, Bezos may not read those emails but his aides and assistants who do have access to his inbox and act on the emails on his behalf do inherit his complete authority.

Some refs:

https://news.ycombinator.com/item?id=16341154

https://news.ycombinator.com/item?id=17193363

https://news.ycombinator.com/item?id=22286350

https://news.ycombinator.com/item?id=9356182

https://news.ycombinator.com/item?id=20782392

https://news.ycombinator.com/item?id=13512106