I have a pacemaker/defibrillator that is no longer supported by the company. They are refusing to admit or assist with rectifying what do I do

I have a Medtronic pacemaker/defibrillator implanted since 2016. This also requires remote monitoring with a device. The purpose of the monitoring is to detect arrhythmias. This is life sustaining. The company is no longer supporting this device. Despite having a year left on the battery. I am continuing to get the run around from the company and having them state that the supported devices are on back order etc. It has been over 6 months and no devices. Despite calls from me, my doctors, the insurance etc. they continue to just say a supported device is "coming" but they do not have any idea when. They can give me no details. A rep from the company did finally admit they do not support that device any longer and the only way I could get another device is if they could recover or refurbish one which was highly unlikely. Yet they continue to avoid and or promise "one is on it's way" although they can offer no proof in the way of orders or other documentation.