Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rip Off

I bought this because it was supposed to include a free upgrade to OS-X Lion. But when I try to download Lion it doesn't recognize my computer's serial number, and when I try the alternate route of sending apple a copy of my on line receipt they won't accept that as proof of purchase.What a rip off!I am sending my computer back.Do NOT buy a new apple computer for a month or two until Lion comes pre-installed.