Stargas centurion

I bought a 48kg gas at stargas and it only lasted 3 and half weeks, and even that 3 weeks most of the days there was no one in the house. i have been a customer to stargas for manny years but this time i believe i was sold half empty gas bottle. Leaks check was done by professional and even Stargas technician came and found there is no leaks on my system and i am told that i should continued buying from them so that they can connect my bottle for me. I have been using gas for more than 20yrs this has never happen i make sure that i ***** my gas pipe properly and check leaks before using it. I am so dissapointed with Stargas given the fact that i recommended them on our Estate telegram group. I will never buy gas from Star gas again