Instruct: Classify the given Amazon review as either positive or negative.
Query: Defective

Received the Headphones in good condition, however only 1 side would work, then trying to exchange them with Amazon, was a nightmare. (I already have a credit, but they wanted my credit card No. which kept defaulting, after 3 attempts including shutting down my computer, nothing, On the returns or exchange pages they s.b. advising that you need to give your credit card.) i wonder what would happen if it was a valuable purchase?Now amazon has given me a credit for the Headphones, value $4.41