I sell articles here on fiverr. A person brought a 500 word article on March 01, 2016. I just got a message from them saying that they believe that a portion of the article is plagiarized. First of all, NONE of the article is plagiarized, all of my work is original. The buyers says that he will leave me negative feedback if I don’t make some kind of change to the work. Since it is not plagurised, there is no way for me to revise the order to make him happy anyway. Is this something I should report to CS since he threatened me? How should I handle this so that I don’t get negative feedback?