Bests & Worsts Reviews from Amazon

At first i could not figure out why this didn't fit properly and kept falling off, immediately i noticed that they looked cheaper than the ones that came with my professional care 4000 but i just could not believe they were not genuine since im buying from what i consider to be a very reputable seller (Amazon), After doing research i realized Amazon sent me a fake product, the item i received does not have a serial number in the back, look at this pictures in this listing to see what i mean, i will notify amazon and i am sure they will help like always, i will still love Amazon as long as they fix their mistakes.