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Duh, had the mat been flat, I wouldn't have caught my foot and tripped would I?. It isn't rocket science.
I have been going in that store every day nearly for coming up to 20 years with no mishaps whatsoever. I was looking at the veg, not my feet.
I don't actually agree with this mercenary practice of suing people left right and centre, having had some cow try it on when I hit her car (and working with her neighbour who she openly told she was putting it on) but when it is genuine, when I have lost money, as in my case, it's a different matter.