Instruct: Classify Amazon reviews into positive or negative sentiment
Query: it does not work , and unfriendly customer service

The product did not work at all. I guess the effect people might experienc is that the strong and very unpleasant tastes just chases all appetite away thus producing appetite supressant effect. Considering the expensive price of the product, it was quite disappointing.One additional thing I disliked was their unfriendly attitude when I contacted them after I ordered the products (I orderd directly from their website). I always dislike the companies who treat clients with little respect once they paid. It suggests that they do not expect returning customers.