The truth of the matter is there is no silver bullet solution, no magic pill, no guarantees, and you should be extremely cautious of anyone who tells you otherwise.
If you have a negative SEO problem or fake rip-off report, it will never "completely" go away. BUT, we have proven methods of moving the problem "out of sight".
We use a tried and true combination of applied strategy to suppress the negative search result links deeper in the pages of search engines. This process is tedious and requires constant adjustments to manipulate the algorithms of the most advanced search engines.