Sorry to hear you're still having trouble. We'd recommend sending a feedback report directly from YouTube, here's how: https://goo.gl/WdI0BK . Make sure to send from the account experiencing the issue. We do review feedback and use the details to investigate and fix issues.
Just to confirm, have you checked our Help Center article for managing comment notifications: https://goo.gl/CKNRJA ? Let us know if that helps.
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