It is your responsibility to report a Trademark misuse to the Publisher but Adthena makes it super easy to do so.
This article explains how to view the Infringement and download the report. The report will show you the date the Infringement occurred, a timestamp and screenshot of the SERP. You’ll also be provided with an evidence link. You should then report it directly to the Publisher by completing the correct form:
For Trademark misuse on Google
For Trademark misuse on Bing