Amazon India — defective product and seller not responding

I had bought a RO of make purolite un dated 15th dec 2018, order no[protected] with warranty of 1year .Till now the seller has not completed a single service .Since last 2 months very huge abnormal sound is coming from the product.The seller is refusing for repair and saying is not selling this product on showing the invoice he agreed and now charging cost for parts as well as service.He is now not responding and even not sending anyone to fix the problem .I request please take up the matter to resolve the issue before it break down completely.And do not allow such money oriented people who using online platform to sell defective products and not bother about post service.
client no-[protected]