As far as I remember I only complained to a restaurant once and it was by phone. I was having lunch at a restaurant with a friend and when I told her what was wrong with my meal she didn't want me to complain because she thought it would spoil the occasion/mood. So I put up with what I had.
When I got home I called and told the manager about it and he said next time we eat there it would be free for both of us. But we would have to tell them in advance of getting the meal. It was a generous offer but we never went back to that restaurant again.
My friend and I both agreed that we would feel like free-loaders.
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