Instruct: Classify a given Amazon review as either positive or negative.
Query: Stopped working after 2 months

I bought this heating pad a couple months ago because it was big and looked like it would cover all the area I needed it to. I have a chronic health condition that causes pain and heat really helps. I also bought this item because it has a lifetime warranty. When it stopped working I contacted the company for a replacement. They informed me I had to pay shipping and handling and needed to ship it with a tracking number. I was not happy. I can buy a new heating pad with shipping cost. They also said they needed a receipt. It's a lifetime warranty why is there a need for a receipt??? I finally gave up, threw the heating pad away and bought a new one,