Extremely unprofessional service

I bought a 9Kg gas on 22/02/2022 and the gas ran out on 21/03/2022. I only use it for cooking. I called to enquire because the gas normally lasts me 3months. A lady by the name of Melody was extremely unhelpful. She kept ignoring my calls. And when she did answer, she said she would call me back and when i called again she put the phone down in my ear.