Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Order disappeared without notification

I'm sure the product is great, I'm very happy with two 2GB I have and so I gave this 5 stars.However, Amazon often cancelled the order without notifying the buyer and the whole order DISAPPEARED from the order history, looks like there was nothing happened. I certianly believe that deserves some legal action. It is the 2nd time to my orders already and I have heard many same stories about that. So, actually they didn't do what the fine print promised."If an item's correct price is higher than our stated price, we will, at our discretion, either contact you for instructions before shipping or cancel your order and notify you of such cancellation."