Pushing down a Ripoff Report is a tough task, even for seasoned SEOs. The link is very powerful and ranks highly for given keyword phrase searches. Let me save you a lot of time and research and tell you that there is a way to completely remove the Ripoff Report (ROR). It involves suing the poster of the article, having a judge find that it is a case of libel, and then submitting the judgment to Google and other search engines to de-index. The chances of you winning a case are very slim, unless it is obvious defamation and untrue. ROR has successfully challenged most lawsuits and came out on top.
It is possible that I can help with complete removal, but this gig is for suppression/pushing down the ROR listing by 10 places, which would put it to page 2. If you want to go further than that you will have to order another gig. The price I'm charging here is less than half of the normal price I charge for this service.
This also takes time. You shouldn't expect to see results in the first 30 days. It generally takes 6 weeks or so before you start seeing results.