Instruct: Classify Amazon reviews into positive or negative sentiment
Query: frustrated

This Ekho E-15 Heart Rate Monitor Watch fell apart on the 4th use (the stop/start button fell out.) When I approached Amazon for information on how to return it for a refund (by email) they referred me to Ekho. When I approached Ekho for information on how to return it for a refund they referred me back to Amazon.Meanwhile, I don't have this very important piece of equipment for my work outs!What gives?