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

i was happy when i 1st startd using this but about 8months to a yr later it stopped working. i contecetd seller who never responded back to me then i read the back of the whisper book and it said to send product to the company w 5.00 for return shipping. well they sent back my 5.00 and kept my filter. no note saying they were going to fix it or not. i would not buy this product from the seller that sold it to me then again i wouldnt by it at all because all of my fish have died and im out the money i spent on the filter plus shipping cost to send it 2 company to be fixed