TTK Prestige — Gas stove fire

Team

Have bought gas stove of prestige last year and since then it's giving issue 2 times the knob gave issue in 30 days of purchase I stay in Mumbai and hardly used it, the service engineer came and told all is ok
Last week I saw smoke coming out from bottom and I saw rubber caught fire the service person came and told it happens sometimes and northing to worry

2 days after it again caught fire and smoke came out of bottom
I am worried for my family life and these uneducated prestige engineer don't care and take it very carelessly how big risk it is
Since last a week they giving assurance of that they will change the part but no luck
Rehana from customer care daily call and take these local engineer in conference but all I get is fake assurance
I lost faith and want replacement of gas stove as I can't use this and put my family life in danger