I have already asked this question to Seller Support and this is the template they have on file.
Case ID 16699486001
1. Enroll in Amazon Brand Registry if you haven't already. Brand Registry provides you with powerful tools to protect your brand and intellectual property on Amazon.
2. Once enrolled in Brand Registry, you can use the Report a Violation tool to report unauthorized sellers or potentially counterfeit products. This tool allows you to submit detailed information about the issue, including the ASINs affected.
3. Provide as much evidence as possible when reporting the violation, including the screenshot you mentioned and any other relevant information that demonstrates you are the rightful brand owner and that these offers are unauthorized.
4. If you're already enrolled in Brand Registry, you can access these tools through your Brand Registry account.
5. Additionally, you may want to review your distribution agreements and ensure that your products are not being sold to unauthorized parties who might be supplying Amazon retail.
So based on what Amazon recommends, it looks like I have to report Amazon retail via Brand Registry. I have done so through trademark infringement as it just requires an explanation and no test buy. Hopefully it works.
But I was wondering if this has happened to anyone and what you did about it?