Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Can not rate it if I never received it!

Amazon.comYou are just gotten too big. Your customer service department is useless.I never received my book. I have made several attempts to start a search to track it down but your system is just too big to care for a small person like me. I will never buy a book or anything from you in my life. I am glad that it only cost me 20 dollars to figure this out.Walter