Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Defective product, worse customer service

One day after I got this, two of the buttons stopped working, forcing me to rely solely on the key to open the safe. When I tried calling Tech/Customer Support, I rarely ever got through to a person, usually I got a recording telling me to call during normal business hours, even though that was exactly what I was doing! I left a message to call me during the morning because I work at night, and...you guessed it. Tech support called me in the evening during work! I had to ask Tech support to call me back the next day in the morning and they never did. I am trying to return this for a refund, but my attempts at correspondences have gone unanswered.