Glen — I am complaining about a glen gas stove

I ordered a gas stove on 31 january. It's model number is glen 1040 gt junior. It's been only one month since i am using it. It's knobs are not working properly and are very tight. They do not rotate. It's very difficult to switch on the gas stove and it's very risky as they do not work properly. Kindly solve my issue as soon as possible as gas stove is used throughout the day many number of times.