Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: I don't understand

I first purchased this from a marketplace reseller. It's counterfeit. Fine. I would just return and purchase it from Amazon itself. Again it's counterfeit.I don't understand why Oral-B is still listing Amazon as sort of a recommended reseller on their website. Everyone who bought counterfeit here should complain to Oral-B and push them to take action on this stupid counterfeit madness.