I'm disappointed and dissatisfied 😤😠😡🤬

On the 18/06/2025 I went and I bought a gas heater and a 9kg cylinder which was empty due to the fact that they had no gas refill. I was told they would call me the next day which they did call me on the 19/06/2025 I went to refill which the heaviness of the cylinder was questionable cause it wasn't heavy at all. I started using the heater on the 21/06/2025 which I would switch on two bars for less than an hour's just to make the house warm then switch it off to my surprise I've never used the heater for mother 2/3 hors on these two days from the 21/06/2025 to the 22/06/2025 on the 23/06/2025 to my surprise the gas was finished. I called them they said I must come. I went there only for the guy who was helping me just tell me that there's nothing they can do because I'm not the only customer who has complained about the gas and they can't help me. I even did my research from people are always having their heater on and to my surprise they were also shocked that this Heather didn't even last 2 days and I don't even switch it on full bars.