Butterfly Gandhimathi Appliances — gas stove

I bought a butterfly gas stove jetgt3b on[protected] and the gas stove was not working properly. It was a 3 burner stove. One of the burner gets off while reducing the flame, the other one gets stain under the vessel. I made a complaint (No. B[protected]), and the technician came 3 times, he told us that this complaint is there for all the models and do something on the stove.

For one week it was working good, but now the same complaint it is showing. The technician who visited is not bothered about the complaint.

Please do the needful.