poor service and installation from Weber and Grahn

When Weber and Grahn sold me a furnace they never told me that it needed someone else to "set it up". The furnace NEVER worked properly. I kep calling and each time they sent someone who made the problem worse. TWICE they spilled fuel on the basement floor and inside the furnace, sending fumes into my home. The last technician to come over told me that their service te3chnicians are not trained to work on furnaces and heating. ANother one told me the unit could blow up.