Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
There is no Google telephone help center. You did well to ask this question.
Are your two different business accounts (Google-and-YouTube, I am guessing, but I am not sure) under different Google usernames? and do you want to just remove the Google Plus and the YouTube content, or do you want to remove the whole Google account?
If you want to remove the whole Google account as well as all Google Plus and YouTube content, then you should close the one Google account. This can be done, with safety to the other Google account, *if* the account you want to remove is under a different email address (or, GMail or Google Mail address) from the account you don't want to remove.
But let me know exactly what you want to remove (account, vs. and/or content, YouTube account, or Google account, or content in either or both accounts... etc.) and I will instruct you specifically further.