Worst customer service,Pathetic customer Handling

I have ordered a product which got delivered to me and its only half, when I spoken to customer care they inform me that its a seller product we have sent a mail and kept me also mark in it, after that recived response from seller that we will send you the details shortly and its been 20 days now the product is still not delivered, amazon is least bother about it dont want look into the matter no customer sense, horrible and pathetic customer service, amazon you guys want be on top of ecommerce industry this way you will be soon on top but from bottom line, if this kind of customer service