Apple India — iphone 5s charger

Address: Kolkata, West Bengal, 700150

One month ago i bought my first iphone. That charger stop working from 30.10.2017 and i reported to kolkata apple service center on 31.10.2017. They told amazon provided duplicate one. But they not ready to provide us denial letter and amazon wont work with out written communication. We have shared to apple company about non-cooperation from service center and apple also not ready to help us but they have given one case no which i have included in this communication. Apple not ready any thing in written and in between i suffered. I want to replace charger because it is within warranty period and i bought it from amazon