Kaff Appliances India — Product not working and customer service not helping at all, service person also ignoring calls

I bought a chimney in May, got it installed and started using from 21 September.
The chimney is not working it so l only worked in the beginning 15 days and now the chimney does not folder anything keeping the while house in smoke.
The filter cleaned process was said to remove oil but it does not happen as well.
I tried to contact the person who installed the chimney but he is also not visiting.
The customer service number in Google is pathetic and replied once saying warranty card check karo. That's it after that did not reply even the actual question.
Never expected this from such a great brand.