Lincare Holdings review: Poor billing practice and awful customer service

I have been renting an INR blood testing machine from Lincare since October 2024 and have always paid my balance due every month online at their old patient portal thinking they knew how to post insurance payments and bill me for the correct amount. On March 29, 2026 they upgraded their system and when I went into the portal it showed I had a balance of $323.17 and review shows that for the entire year of 2025 each month they should have been billing me $45.00 for my copay but instead they only billed me $20.91 and I assumed they were billing me correctly but find I should have been checking with my insurance. So, when they upgraded to their new system it showed I owed an additional balance of $24.09 for each month in 2025 making the total due the $323.17. I have done billing and insurance follow up for 25 years with hospitals and I could not understand why it took them over a year to bill me correctly. I have made about 8 phone calls to them to clear this matter up and each customer service rep kept saying I owed the money. When I asked to speak to a supervisor, they gave me lame excuses because I don't feel I would have to pay the bill since it was their error. I was transferred to one supervisor yesterday, but she pretended she couldn't hear me even though the customer service rep could hear me fine. The first statement I received in April 2026 had a message stating this was my third and final bill when I had never been billed for the amount until that statement. Two days later I had another statement that stated they were sending me to collections. I went ahead and paid the bill online on 4/21 through my bank card and it was taken out of my account. Today the balance is still showing I owed it. I had called yesterday and the rep informed me he would escalate the information so the balance should be zero by today. Finally, after arguing with a different customer service rep, I was able to speak to a manager who told me the same lie that it would take 7-10 business days for it to show a zero balance on my account on the portal, but she could not explain why. She stated she would pull my account back from collections, so I didn't need to worry about it. I am so angry because this is fraud I feel and they are a horrible company to do business with. There is no other provider in my area that I know of, or I would transfer to a different company, but I am stuck with them. They have very poor customer service and are a very poor company to do business with. It appears they have had multiple bad reviews and I can understand why. In the future I guess I will have to do their job for them and look at each of my insurance EOBs to make sure they are billing me correctly. I did speak with my insurance company and there was nothing else they could do for me. This is just a business out to cheat their customers out of money when they are sick and old.