Lincare Holdings review: Worst customer service ever

I just started using this company because of a contract with Humana. They refuse to give me what i am trying to order then they tried to force me into accepting the wrong size headgear and refuse to replace it. They are the worst. Im ready to go back to UHC just to not have to deal with Humana and Lincare BS. Also they charge more. Not sure if Medicare will do anything about that.