Call up CNN and offer to demonstrate how BIOTRONIC is so evil that they refuse to fix their pacemakers. Hook it up to an ECG and use your phone to make it flatline. Then turn to the camera and tell the audience, "because BIOTRONIC doesn't want to pay to fix their product, I can now kill your grandmother just by walking past her on the street." Watch how long it takes them to fix it then, and watch how reactive they b…
First, you have no idea what the manufacturer needs to do to fix the problem, alert customers, do recalls and recertifications, and the like.
Second, you put yourself directly in the line of fire unnecessarily and for all the wrong reasons. You could find yourself on the end of all kinds of legal trouble, and on top of that you would be morally culpable for any harm.
Do it the right way: get a lawyer. The lawyer will know how to contact the vendors, the regulatory agencies, media if necessary, and customers if necessary.