My experience with RAVPower products has been great as well, but last time I ordered they literally put a card in the box saying "get a $35 gift card for giving us a 5-star review." I'm surprised it took this long for Amazon to do anything.
~2016 I worked for an Amazon Marketplace seller – avoiding the banhammer was our biggest priority, having been banned once because a unisex fragrance (perfume) we sold "smelled too masculine" and therefore the customer told Amazon it was counterfeit.