A week or so ago I was doing windows & outside patio door is a step of two slabs and I stepped back onto edge after cleaning the window & a corner snapped off where it hangs. Customer wasn't happy understandable but I don't feel its my fault as its meant to be stepped on. I asked how long ago it was done & she said last August. She wants to go through my insurance, I told her to get builders back & they did today apparently and they fine with it. So what shall I do??