Kaff Appliances India — Kaff Hob issues with burner

I bought the kaff Hob this year and within 6 months...I encountered lot of problems and called service centre. They come and repair it..again I called, I have spent nearly 3000 and now the service guy says there is problem in the burner. Ignition is not working too.Need to change. Why is the quality so low. I need this to be replaced free of cost.