Received an email and a letter (not certified) from Lonstein Law Firm in New York. Being sued by Zuffa for illegally streaming a UFC fight on July 6, 2013. Responded within the 10 days as stated, according to the legal assistant, "at this level" I am to pay them $7,500 or further legal action will be brought against me. They claim they have "proof", my IP address, and chat logs (which they refuse to give me). So as it stands right now, they want $7500 with just their word that there is proof. I didn't watch anything illegally so I feel proof is due. Is this legal? Should I hire an attorney? I am almost convinced it's a scam, but don't want to end up on the short end of the stick if this is legit. Please help.