REACT dot Org Infringement

I got my product taken down by Amazon due to IP infringement. It was opened up by a company called React.org, supposedly a non profit organization helping companies with infringement issues. I would like to fight back but I’m unsure if this is a legit company with serious legal clout or a scam. So far the only few things I found online seems that they are not very legit, however how can I combat them and fight with Amazon to get my products back up?