Amazon India — product not delivered and cancelled

I have ordered one mobile phone from amazon during there sale with exchange offer. When the delivery agent visited my place and the way he was talking is not at all acceptable. Then he connect me to one of his senior who told me that he will be visiting my place in another 15 min and will delivery the product. But in the meantime he cancelled my order without telling me. When i call the amazon customer care they have given me the surity that they will arrange a replacement for the same. But again when i called them again they refused to do the same and the person from the call center sort of head told me that was the wrong commitment and we can't do anything for the same and do whatever you want to do. So request you to please help me with the same. My request to other people not to buy any product from amazon it's a fake company.