Complaint Against Singh Collection for Non-Delivery of Watch and Blocking Customer's Number

I would like to raise a complaint against an online seller named Singh Collection. I ordered a watch from Singh Collection and paid ₹600 for the same. It has now been 3 days, but I have still not received my order. I have tried contacting the seller multiple times through phone calls, but they are not answering my calls. Moreover, they have blocked my phone number, which makes it impossible for me to contact them regarding my order. This behaviour appears suspicious and raises concerns about possible online fraud. I request you to kindly look into this matter, take appropriate action against the seller, and help me get either the delivery of my watch or a full refund of ₹600. I am ready to provide payment proof, order details, screenshots of conversations, and the seller's contact details as evidence.