Yonks ago I drove to work at the crack of before dawn. I had de iced the windscreen but took a diversion into a vale and freezing mist turned my windscreen to a sheet of ice. I had to drive dog like, head out of the window
A few days later and ever since then its been heated front windscreen as standard. Never again.
Based on the information posted, I offer my thoughts.Any action you then take is your liability. While commending individual effort, there is no substitute for a thorough review of documents and facts by paid for professional advisers.