Fitness Blowout / free motion treadmill w / ifit

The treadmill has never worked properly. The speed either does not change when commanded on the console, or it changes abruptly with no warning. The emergency stop cord does not work (the treadmill does not stop). This is a serious safety issue. I had purchased the Lifetime guarantee with free labor. I have contacted Fitness Blowout numerous times, but nothing has been done to either fix the machine or replace it.