pantasy pantasy is a scam, worst fabric and completely transparent

I have found a advertisement on social media and contacted to pantasy pantasy for cotton pants. after placement of order on COD they asked me to pay 49/- as confirmation of delivery and after delivery I paid 850 to the delivery boy. and then I opened my parcel and disappointed too much. as the pants were cheap quality and very very transparent. so I asked them to take back the pant and refund my money. but they refused to give refund but confirmed that he can exchange the same with other colors as per your choice. but after that till date they are not picking my calls.