Elica — 4 burner gas stove

I had purchased 4 Burner Gas Stove on[protected]. There was problem with knob at the back. I had to get it changed as J I had to use it in my kitchen at Bengalore. Then I had to call service engineers from Elica twice, one on[protected]band again on[protected]. They could not repair it and said as it is a manufacturing defect and cannot be repaired.
My father visited me recently and noted that it is risky to work with it as the flame was coming with sound as can be seen in the attached video.
I filed complaint and I was assured that it will be replaced. But the number of the officer is not working. I suspect it is some fraud call.
Elica India Complaint Status Upd ate [ID: 3389272]