need help

Hi all can someone help me?My oxygen provider is really a lousy one I haven't seen them since Nov,they left me 10 canulas,As anyone knows thats on oxygen the nose piece get really hard and can cause so much pain and headache's at times,Is there anyone i can report them too?I try calling Medicare but that was a complete wash out,the guy that i spoke to well....lets just say i knew as much as he did,All he did was read one for one what the book said,and i so tired of fooling with this medical provider,and since they are capping these concentrator's  off no one is wanting to take me on as new because i been on it since 1999..they say they would make a profit,so maybe theirs some who i can call on them,Thank for any and all help.