[Resolved]  Snapdeal.com — call claiming i won iphone 7 plus and transfer of rs 4598 via paytm for registration

I received a call from a women named ranjana from no. [protected]claiming to be from department of sales and promotions of snapdeal. She had my name and address and was claiming that i have been a choosen a lucky draw winner for snapdeal and can choose from five gifts (One was iphone 7plus).
Than she asked me to choose any two items from snapdeal worth minimum rs 4000 and to pay for it via paytm. She transferred the call to some accounts department and they claimed that i will receive the prize with my orders.

First of all, how snapdeal is leaking our personal details (No. And address)?
And secondly why is there no customer care executive from snapdeal when we try to contact for the authenticity of these types of calls.
The no. Even is showing snapdeal.com on truecaller and during payment through paytm, the page generated was also snapdeal's.