Prestige — leakage of gas from left knob

Address:

New Delhi, Delhi, 110043

I bought a prestige gas stove last week. From the very first day there was a critical problem with left knob. When we try to turn it off it starts leakage of gas with horrible sound. It's a serious issue. We use to turn off cylinder regulator each time after use for safety purpose. Earlier i prefer to use prestige products but now i am very much disappointed.