Lincare Holdings review: Poor customer care, unresolved invoice

I have attempted to discontinue my auto ship and autopay with Lincare since March 2025. Every month since March I have contacted them, and every month I am advised that my calls are recorded which indicates they can go back and review every call and conversation. This means that they have the ability to go back and hear every conversation I have been making these requests, and the person at Lincare assuring me that it is taken care of, and that they made notes in my file.
I received an unsolicited shipment in July and called Lincare again. At that time there was also an outstanding bill that I was unaware of, but I paid it in full and requested a shipping label to send the current shipment back. I never received a shipping label but did receive another shipment in August. I called Lincare again, and after being passed around to several associates, I finally talked to a gentleman who said all the others I had talked to in the past had no authority to stop anything, but he had the authority to do so. He immediately sent me a shipping label on August 15. He told me I could send both shipments back in the same box using this label. On August 20, 2025, I dropped my shipment consisting of both July and August’s packages, as well as the invoice I had received at that time, at the Rapid City UPS store on Eglin. The package was delivered to Lincare on Monday, August 25, 2025.

September 17, 2025 I received another invoice for $13.52 and a pending insurance balance of $205.07. I have the confirmation that Lincare received the items. I called customer service and after waiting for over a half an hour on the phone, I finally was talking to an associate. Again, they informed me that the call is being recorded, and I explained that I received another invoice and that it’s possible the shipment and invoice passed in the mail, but I should not have a balance with Lincare. They were going to look this up, and after waiting on hold for several minutes again, I didn’t hear anything else. I wasn’t sure if I was on hold, or if they just weren’t saying anything, but I could tell that we were still connected. I tried to get a response but nothing. After about 10 minutes of silence on their end, they hung up. I called back and again waited almost 30 minutes to get an associate on the line, and explained again what was going on, and they hung up.
October 14, 2025, I was hoping that the bill and the returned shipment had passed in route, but I received another invoice. Same thing, owe $13.52 with $205.07 total insurance pending with primary insurance identified as Wellmark BCBS SD-FED, which I have not had since April, and I had told everyone I have talked to up to this point that my insurance had changed. I called Lincare again today, waited on hold for several minutes to talk to someone. Aiden in customer care took my call, and as with every call in the past, informed me that this call is being recorded. I also informed him that I am also recording this call. After he confirmed all my information, including that they still have the wrong insurance (but he did see in the notes that I had made a change, they just haven’t on their end), he informed me that he has to pass me on to the billing department and gave me a number in case I get disconnected. The number he provided me is the same one I had called him on. As in the past, I sat on hold for over 28 minutes total and Lincare hung up on me.
I called the number back, after waiting about 10 minutes, Bau answered the phone, confirmed my info, told me to hang on a second, then after a few minutes Lincare hung up again.
I can’t get a person to talk to me at customer service to clear this up. They tell me to hang on, after I have already been hanging on for several minutes. I truly want to get this taken care of. There should be no outstanding balance, and I should not receive anymore shipments. I’m concerned they will send this bill to a credit agency and wreck my great credit.