Image copyright infringement claim from COPYTRACK

On 26 November 2025, the German company COPYTRACK emailed me alleging that by publishing an image on my website I have infringed the copyright of a French company, CONCEPT-PRODUCTION, whose image licensing rights COPYTRACK claims to monitor and protect. COPYTRACK demands that I either (Option 1) purchase, for €389.59 a "subsequent image license [which] includes past and future use for one year after purchase" or (Option 2) compensate the alleged license holder for unauthorised past usage by paying €350 

In January 2017, I downloaded the image from Adobe Stock for free, as I was entitled to do because a free trial offer allowed me to download a few images for no cost. 
The image in question, 'Kerzenlicht', Adobe Stock #10474424, is still present on the Adobe Stock website.  The image info. identifies the contributor as "Bernd S." and clearly indicates that use of the image is covered by Adobe Stock's standard license terms, which allow me to "Post the asset on a website or social media site with no limit on the number of views."

Therefore, COPYTRACK's allegation of copyright infringement seems false. Every online review of COPYTRACK that I have found describes the company as 'license trolls' or 'scammers'.

What should I do?

Best regards,

Rob Stuart
Utrecht, Netherlands