Started using a oxygen concentrator on 1/16/15 self pay and on 3/16/15 payment was due so I took the payment to the office and paid it. Three day later I had a Doctors appointment on 3/19/15 and the doctor said I didn't need the oxygen any longer so I called for them to pickup the concentrator and prorate for the three days I used it . Di Hetrick said they don't give refunds. She also said they charge Medicare customers for the full month even if they only use it for a day and also stated that they don't refund Medicare either . I have read all the paper work I received with the unit and there is no refund policy . She said just keep it until 4/17/15 even though I don't need it . I felt she is very unprofessional and rude .