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!
Our Help Center resource on custom URL should help answer your question. Check out the "Remove custom URL & claim a new one" section of the article: https://goo.gl/GnrgVj . Hope this helps!
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