Instruct: Classify an Amazon review as either positive or negative.
Query: Did not receive the product.

I bought a set of classical (nylon) guitar strings a couple of months ago. They were labeled as "student" strings. I received them promptly, and they were so good that I ordered another set over a month ago, but they never arrived. So, I can't rate them. But the service actually gets no stars. They kept my money! (1 cent!)