Mujse advance 25000 lelyia product nhi dyia refund nhi dyia 3 mhine hogye abhi tk refund nhi aya parehsan nhi dyia

I had contacted an online seller/business dealing in CNC cutting for a product. I paid an advance of Rs 25,000 to him for the product. The seller did not deliver the product to me. When I asked for a refund, he only returned Rs 10,000 out of the Rs 25,000 I had paid, and has not refunded the remaining Rs 15,000 since then. It has now been more than 3 months and he is refusing to pay back the balance amount. I request that the seller be directed to refund the remaining amount of Rs 15,000 to me at the earliest, since neither the product was delivered nor the full advance amount returned.