I have a defective Oxygen Concentrator and called Lincare yesterday Morning Thursday March 13, 2025. I was told a new Concentrator would be delivered today. I have not received new equipment. I'm 80 years old and on Oxygen 24/7. Lincare is the worst company to deal with. Customer Service is disgusting. This is the 2nd time I've had equipment issues and both times dealing with Lincare has been a nightmare.