I have never been so upset with anyone in my life. I have severe copd and have the rsv virus right now. My oxygen level is tanked with oxygen. I requested for my portable tank to be refilled so I could get to the doctor and because they don't want to refill it before I have a test done I have to go without air. No one for any reason should strougle for air when there is an option not to. They said I should go with bad oxygen levels. Not a problem there