Hey there, have you tried removing the video by selecting "Not interested"? Also, here's our Help Center resource on how to manage recommendation: https://goo.gl/mNSFA3 . Hope this helps!
Please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks.