Is it safe to buy iPhone 6S from paytm and how to

Hi everyone I wanted to ask this question about buying iPhone 6s from paytm and also how to claim Apple warranty for the online purchase as I have heard some negative views about paytm on other social networking portal saying that the products are not genuine and sometimes fake products are sent. I'm bit worried now and would request you to please this answer question as it is quite urgent
Thanks you 

Need a good phone below Rs.999

Please suggest me a phone having a good display with a dual sim having auto call recorder and some social networking sites like facebook so that I can remain connected with my friends.I wish to gift it to my sister.

Want to buy a phone for long term use!

budget around 8K or less

i don't play much of games..
i need a phone which can be used for reading and social networking and messaging.
like mostly for the professional use..?

can anyone one suggest a good phone and with experience,
plus i thought of microsoft lumia 535 dual sim is that a good phone ? because OS is not a mandatory thing , i am comfortable with windows