pple iPhone is still in warranty but not replaced and talking rudely

Location/place: India

My complaint is for U.C. INFOSYSTEMS PVT LTD, COMMUNITY CENTRE, NARAINA PHASE I, NEW DELHI-110028

1-2 month ago my iphone stop working and i send some one else to replace my iphone,that time apple swap my iphone and gave me other and now suddenly its display stop working and i go to apple store to replace it again they said i am not the same person who came their first time and they speak very rudly and said they will not goin to replace it.
i send some one else it doesn’t mean its not my iphone i have bill and the slip they gave me after replacing my iphone. they think i am a child and trying to fool me. when i talk to apple website chat support they said they will replace my iphone and give me new one but why that person name kamal talk to me so rudly and not replacing my iphone?