Fraud

I had precisely the same experience and finally took the machine back to them myself although I had been told not to lift over 20 pounds. I had called them repeatedly to get it but they would not. When I took it back they told me I couldn't without a doctor's permission which we all know is blatantly untrue.
I received a final billing and sent them a check on which was written pyt. in full in the memo column. No further billing was ever sent. None should have been as no service was provided at all after the machine was returned,
Now more than a year later I am getting dunned by a collection agency. When I contacted them regarding this as told them I had the cancelled check to prove it was paid, I was told that they would try to collect anyway.
They sent further correspondence where Lincare claims that that bill was for an earlier period and that the money was still owed.
As you can see there is no way to deal with them. Apparently I will have to get a lawyer. I do know that the medicare carriers will no longer do business with them and we have to use a company that is located about 85 miles from us.
You will find an article online where the company pays 3.15 million to end an investigation of its practices in California.