GreenChef — gas stove burner flames are very low

Address:

Hyderabad, Telangana, 500072

Green chef stove: we baught this some 5 years back along with hp gas cylinder as a kit.. We haven't used till now just recently one month back started using this it is 2 burner stove.
The flames are burning very low.
The stove immediately gets off whn it is turned to sim.. So we are not able to cook at low flame.

We tried calling customer care number a several time from past one week, but the call is not connecting. Please contact the respective engineer and resolve the issue at the earliest.

Thank you.