Lenovo - Gift not delivered

I got a call from shoppingzip and they told me that I have won a gift from shoppingzip startup, and I purchased a product form shoppingzip and they said after ** hour u will get a call, your gift will be revealed. As I got a call,they told me that I have won lenevo laptop which cost *****,and they want me to pay GST on it only then they can delivered this product, I payed gst ***** to their acc, they told me that after ** hour u will get a call of dispatch of your product, but again they want me to pay insurance charges and courier charges on it. I refused to pay, and demand my money back. But he is reufused to pay money and drop the call.