Well think about it. When you buy clothes, does it come with the detergent to wash it or the washer &/or dryer to clean it in?
Or, when you get a haircut, does your stylist come back to do maintenance?
The SS fabricator is that, a fabricator and clearly they do installations. Usually, either a homeowner does the tearout or you hire a contractor. So, I would be a little surprised that you hired a contractor that doesnt want to do the tearout because I wonder what he does do. I used to work for a countertop fabricator & we did tearouts but it takes a lot of time & has a possibility of going badly (what if you hit a wall, drywall can come off, lots of possible issues), so I cant say I'm surprised they wouldnt offer the service.