Superiorpapers.com and all sites affiliated with them - You are a fraud! a scam! and a cheat!
I understand you had a bad experience with one essay writing website; but have you ever ordered anything from their affiliates? How would you know they are "a fraud" too? It's like you claimed that VH1 promotes violence just because you saw a violent show on MTV (and VH1 and MTV are owned by the same parent company).
Are they gonna fly over here and claim libel? Under what jurisdiction, lol
All they could do is to hire an attorney based in the US (there are plenty of those, some are very inexpensive) and sue you for libel in the US. They don't even have to be here; all can be done over the phone/Internet.