Girias India Investment — Disappointed with the product purchased

We have bought preethi valentino 3 burner stove for a housewarming function. We have unpacked the burner after two weeks of purchase on function day morning . The middle burner was not litting the fire when turn it to Sim mode. I have called nagercoil branch where we purachased and asked for replacement of stove and they disagreed for the same due to the gap between the purchase and the day we found the issue ( but to us its a new stove opened on that function day and same moment we found this issue). They sent preethi mainitance people and they changed some valve and they told issue is resolved. Again we face that issue for one more burner ( this time the issue with burners) again i called and checked for replacement .they disagreed and they again sent a person from preethi to do a maintane .also gas leakage issue is there. I m so disappointment for the first time with Girias shopping. In the same shop for the same function i have booked fridge also . I did my entire home appliances shopping at chennai velachery branch ( more than 2 lakhs ) and the product was so good. So i opt nagercoil girias . But very bad response and disappointed just for 8k stove .if you can replace it will be helpful.