Symphony Limited — Symphony VFD for Venti-cool 20U

2 months back, I purchased Symphony VFD for Symphony Venti-Cool 20U to control the speed. It's making such a loud noise which is unbearable. I am following up with company for fixing or refund but they say their product will make such a huge noise. Pathetic response from Symphony for a Rs. 17000 product. I would recommend not to buy this product and moreover this shows their policies around customer satisfaction. I complained via their website but there is no response. Pathetic products