Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not happy

One week after purchase, the product stopped working. We followed the manufacturers instructions and sent it to the repair center. We received in return a phone that was rebuilt. The original one year warranty was voided and a new 90 day warranty in its place. We only had the phone one week. This company evidently does not stand behind it's product or services. DO NOT PURCHASE.