TTK Prestige — Prestige Smart Kitchen Gas stove fired at Knob. Not safety to use

I have purchased 3 burner silver gas stove on sep 2020, we having warranty until sep 2022. I am not satisfied after buying it due to the metal quality not good when compared to my old gas stove and also when burner flame ON spill tray color changed due to heat in the first time itself because of it is too close to burner and the middle burner not having convenient space to use. Design not perfect, after informing this to the shop owner and asked him to take this back on day of purchased he refused to take back and he raised complaint for it and the technician came with big spill tray and replaced it, without full satisfaction we started using.
In 6 months when we reduce Knob to Sim it turned off. Some times we feel gas leakage smell while using and even turned off. We check fully is that leaking near tube joint to stove or gas but can't found. So we leaved that smell due to turn on.

In this month after cooking we turned off all 3 gas stove and we are near the kitchen, heard a burn sound and went to kitchen, we are shocked that the last Knob is fired even all the burners are OFF. So turned off the gas cylinder fast. Thank God that we are near kitchen, nothing happen seriously .

We trusted brand PRESTIGE and buyed the product but now so afraid to use and recommand.

So we raised compliant, they sent technician to repair but we not like to service it, in a year it leaking gas and making life dangerous. Even after service how sure that it can't happen again.
We have talked with vel agency( place we purchased), sales manager, technician, customer support but no solution satisfied us.
Tried calling trichy Sales and service manager by getting number from agency but no solution, now they not attending call and no response.
When issue with product everyone is avoiding, not giving solution, it leading to not trust the company.

We don't like to use this gas stove again by service it, because gas leakage may cause life danger. Kindly refund the amount.

Will you able to give guarrenty that same issue will not happen again when service?

Compliant number for your ref: 77392, 77702, TIRU2456398.