Hey there, to clarify, when you block a channel on YT, they'll not be able to comment on your video but you'll still see their content. Also, have you tried removing the content by selecting "Not interested"? Doing this influences how YT suggests content to you in the future.
@TeamYouTube hey guys i had unsuscribed him because he isn't the guy i know before,, still i am getting his video suggestion on my youtube wall 
please solve this, kind requestpic.twitter.com/WFCuptoYSZ
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Thanks for suggestion
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