Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pet Chime

In December 2002, I purchased the pet chime and paw & two additional paws. I was extremely satisfied with them until the past couple of weeks. In the past couple of weeks 2 paws have stopped working for unknown reasons and repeated emails and phone calls have gone unanswered by Lentek. They're great, IF THEY WORK!