[Resolved]  Snapdeal.com — fraud

Today i got a message and a phone call that i won a tata safari on 9th anniversary day of snap deal. They asked me for a money around 5000. And i don't understand how they come to know my address, phone number, pin code, and other identity like what i have order. From where this detail leaked isn't it snapdeal leak or sell their user data?. Why there is lack of privacy?