Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A complete ripoff

I ordered a set of two cartridges for my Pitney Bowes postage meter, and paid for two. What I received ten days later was just ONE cartridge. And worse, the paperwork included with the order had NO contact information for the company I ordered from -- not the name of it or the phone number or Web site anything. It just said "Amazon merchant" on a generic receipt for TWO cartridges. I am sure this is a deliberate effort to rip people off who buy little things from merchants without keeping track of which merchant they purchased from. I made a brief attempt to find the company's name but it was not worth my time. I simply vowed not to buy inexpensive office products from any of these no-name Amazon "merchants." Lesson learned. Go elsewhere.