American Home Patient Charging me for supplies I didn't receive. Atlanta Georgia

I had American Home Health for 18 months and found I had been charged each month with supplies I have never received.  I changed providers and went to the local office of American Home Patient to obtain the necessary paperwork, and to tell them where to fax my information, even gave the fax number to them. 

After, several days of calling they finally sent my info to my new provider.  That was June.  In December I received a bill from American Home Health for supplies "delivered" in November.   When I called them and asked about why I was getting a bill, and there were supplies on the bill that I have never needed with my machine, plus they were no longer my supplier, and I never received any supplies.  

I have had two more bills delivered and today (January 16) I called and they said I was on auto-ship.   "You are not my provider and I didn't receive any supplies."  I was told that I had to come up with the supplies, and send them back in order for them to take it off my bill!!