One alternative is to create a website that outs the company that is harming you in a way that is non-libelous and just tells your story, and then focus fully on SEO and GEO to ensure that the other company sees your site front-and-center when searching for their own.

You may get more attention this way, because it can affect the company more than the optics of a legal dispute. It’s not revenge, and you shouldn’t have that intent, if you want it to work.

However this method, and other similar methods used in the U.S. such as filing BBB complaints, are mostly used for harm done to consumers rather than businesses affected by disputes, so it may not be the best advice.

>One alternative is to create a website that outs the company that is harming you in a way that is non-libelous and just tells your story

Ironically this HN post will probably be higher in search results for their name.

OP it looks like the company is French -- maybe try contacting their local elected representative? Open by stating you are not a constituent, but worried about the impact to their district if the dispute is not handled well.

In parallel, reach out to a local library in Paris and state that you're looking for pro-bono trademark law assistance.

I used to work in public policy, and you'd be surprised how one or both of these methods can yield results.