Dear @Pankaj
If the cylinder is defective and leaks the gas, please contact your gas distributor agency and exchange it as soon as possible.
You can call your agency by using the phone number provided in the gas connection booklet or booking diary.
As proof, use the slip of connection and then ask the agency to exchange the cylinder due to defect in the pin valve while using the regulator to connect with the gas stove.
For the safety standards: What to do in case of gas leakage from cooking cylinder?