Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective and never got a replacement

Received humidifier within a week. Filled it up, plugged it in but it never worked. Light came on but no mist came out and bottle was still full 3 days later. I requested replacement via Amazon.com. Shipped back old (broken) one and was informed new one (replacement) shipping out immediately. Over 3 weeks later and after 3 calls because I never received replacement, I finally requested a refund from Amazon.