Zoll life vest Billing for services over 1yr old when Medicaid won't pay any longer. Pittsburgh Nationwide

While in the hospital in June 2014 after suffering a heart attack and stroke, someone came in and put a Zoll life vest on me. I did not have insurance and they were trying to get me Medicaid.Everyone knew this at the time. I have no idea who ordered the vest, who put it on me but I was told I had to wear it twenty four hours a day. So I did, for approximately 5 months. I did get the Medicaid insurance in August, which covered the services retroactively back to June. All bills were covered, or so I thought.  In September of 2015 (yes over 1 year after the initial vest was put on)I received a bill  from Zoll Life vest. I spoke to some kid (sounded very very young )and explained that I had the insurance at the time and why are they billing me a year later?  He said they had a billing mix up. I told him that wasn't my problem and to go through the insurance co. He said they weren't paying the bill. I asked to speak to an operator and they put me thru to some lady that was rude and wouldn't listen and I Told her I wanted a supervisor to call me and she finally hung up on me. Never got a call from a supervisor. Two months went by and got another bill from them.  Called them and explained the situation again to another person. The reason they weren't getting paid is because a year had gone by and they hadn't billed the insurance company. This is no small bill. It is for 3370. I told them it was their fault for not billing the insurance company and I was not going to pay for something because they had a billing screw up on their end. I told them it was bull**** and the guy hangs up on me after once again asking for a supervisor.   So I have now left a scathing message for Jason Whiting, who is the president of Zoll Life vests. We will see if he has the decency to call me back.In the meantime I have read numerous reviews of Zoll and there are many, many reviews on their incompetence in the billing department and I thought it was time to let people know that IT IS NOT OK TO RANDOMLY PUT ON VESTS WHEN PEOPLE ARE AT THEIR MOST VULNERABLE TIME (almost dying from a heart attack),NOT BILL THEIR INSURANCE COMPANY FOR OVER A YEAR, and expect to get paid because they never sent a bill to the customer or notified anyone after waiting a year from the service time. It is reprehensible that they should even be allowed to bill customers directly due to their incompetence in the billing department.