Sorry to hear of all your misfortune. If I were you, I would speak with a lawyer. Have papers served. If you show the company that you are done with this and mean business, they may take you more seriously.
There are a lot of people that threaten to sue etc.etc... But few actually follow through with it. So businesses are reluctant to give everyone what they want right from the get go. But if papers are served, might change their minds in a quick hurry.
You need to act on it now. Don't let this fester too much longer. And get yourself a new system installed properly. And go higher efficiency.