Gas cylinder not filled fully, only lasted 5 days and on this 5 days some days it was never used

Last week Thursday I took my 5kg gas stove. That only last me only 5 days, and normally it lasts me a 3 to 4 weeks , I don't know if they didn't fill it up full or what happened because it's now a waste and it's our first time filling it up there , what a waste of my money, may the company look into this matter we still have the slip with us , 5kg can't last only 5 days where we not cooking almost everyday it's highly impossible 💔 😢, and in this 5 days after filling it some days like weekend it didn't work. If there's anyhow the store manager may kindly contact me to see through this matter 🙏