>The person who wins the lowest price box is not the lowest price. It is the lowest price who agreed not to sell on other sites for a lower price than one Amazon. You as the customer are being tricked.

There's no dark pattern involved here. When the buy box doesn't show you the lowest price, you usually see something like "Available for a lower price from these sellers" or some wording like that. In my 15+ years as a Prime customer, I've seen this quite a bit where I can find a competing offer for a lower price, often though with a longer delivery time.

>Where is the chat button? Where can I ask a question? Where can I let Amazon know something was wrong with the refund they sent?

I'm going to assume you're not writing this in bad faith and that this isn't a rhetorical question. From Amazon.com, I see "Customer service" is the second link from the left just below the search box. From that page, I see a big box in the center titled "Returns and Refunds".