I paid $99 to have the technician look at the shower and ask how he could turn on the water without getting wet. He did write an estimate to change the thermostatic cartridge if I can find the part. I found the part myself but have no confidence your company will be able to do the work.
When I scheduled the appointment I described my enclosed steam shower. You should have sent someone who knew something about that product or told me to find another plumber.