Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sent the wrong size

I ordered this 65 cm ball and when it arrived, the box said 65 cm but the ball measures 55 cm. This seems to be a common problem with exercise balls in general, and I suppose one advantage is that this ball is direct from Amazon, so returning it and getting a replacement is relatively easy. Still, I looked into this issue before deciding on this ball, and this ball seemed to be pretty good in this regard, so I'm frustrated.