Indoshop — forced me to buy package via using false information

Few months ago, I received call from Indoshop saying it's from bank and you won a package of some coupons and stuff. Despite saying no like a million times, they insisted me for buying saying it's compulsory and it can lead to cancellation and forced me to made purchase to 10000. And they're very experienced scammers who only recorded the other calls not the marketing call where they forced me to buy it. I tried cancelling the same via calling or text over WhatsApp but they talked out rudely and denied to give the money back. Let's get together and take down them. They seem to enjoying scamming the income from middle class people and manipulate them with the help of false information.