Oh no! Just to check, have you tried reporting these comments as spam with the steps mentioned here: https://goo.gl/fWNUpK ? Also, you can block such contacts on YouTube and they won't be able to see or comment on the content you've posted: https://goo.gl/5qtMzL
Just to confirm, have you already tried these steps to report these comments: Click on the 3 dot menu option > Select the reason for being inappropriate and report it? Let us know if that helps.
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