Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Amazon should step up to the plate!!!!!

Amazon should step up to the plate and refund, replace or at least credit customers who purchased the defective 2 disc version of this great documentary regardless of when it was purchased. I purchased this dvd earlier this year but had seen my son's version before so I didn't watch it right away. When I did try to watch it,I was more than perturbed to find that it is missing Part 2 which is supposed to be on the flip side of Disc 1. This is a defective dvd sold by Amazon and they should stand by their product!