Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not satisfied and not amused

I paid for this product, and three days later the money was refunded to my account. Apparently they had sold the same calculator to two people, then sold out. I'm sure the product was great as evidenced by it's popularity, but it was rather irresponsible of the company to oversell. I needed the calculator for my math class at college and wasted three days waiting for it to show up.