Apple India — Iphone repair

Address: 401107

I bought a iphone 6S from amazon on 21st March 2018 bearing IMEI no [protected] and SNO C6KQX0DLGRY9 from AMAZON .
Last week my phone got wet- so I submitted the phone on 9th July 2018 to I World, Shop no 7, Cine Prime Mall, Below Cinemax Theatre, Beverly Park, Mira Road-East, Thane.

I got the phone in the evening and they said it had damages on the charging point and display . I was travelling from 10th July till 13th July 2018 so could not take it to Apple authorized service centre. I took the phone to Apple service centre- Aprtronix, Borivali-West, Mumbai on 14th July 2018 and they said that since the phone was opened -it was not eligible for repair, further they said that some of the parts are not original . i was surprised as i had bought it from Amazon and so i took it to I world- the place where I had given to check for the 1st time on 9th July 2018. They said that I bought a duplicate phone . i was aghast as i felt cheated by everyone.I came home and checked the Sno and IMIE no on Apple site- they say that phone is original . I do not know whom to blame and whom to complain - either Amazon has sold a refurbished phone or the service centre- I World has changed the original parts on 9th July - when I gave them .