Vitalaire Service is beyond poor, it is non existent

My dad is on oxygen 24/7 with stage 4 COPD. On 21 December and again on 30 December I reported that the concentrator does not provide sufficient oxygen, and we had to start using the "backup" cylinder. I tried to call their landline, but they do not answer. The one time I managed to get through, the lady told me that their system is down and she will get back to me, needless to say, I am still waiting for that call. My dad is in hospital now due to a lack of oxygen and lung infection. I am very disappointed and disgust by the service from Vitalaire:-(