Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A defective piece

I purchased this item on Sept. 6 this year and haven't used it until a couple of days ago, then I found it didn't work at all. I thought that the battery was dead, so bought a new one and put it in. It still didn't work. I want to return or exchange, but realized that the return window has been closed on Oct. 17. What can I do?