Hey there, just to confirm, have you tried reporting the channel/user using the steps mentioned here: https://goo.gl/e2csU5 ? When this is brought to our attention, we act quickly to address it.
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.