Feeling guilty of something I did

First of all, I am not sure whether I am posting in the right forum. My apologies if this is not the right place. I recently went to a restaurant and when I ordered dessert, I found a mosquito inside the bowl of the ice-cream. I asked waiter and he apologized right away and replaced it. In the suggestion book even though my family said not to write, I ignored them and wrote my complaint in anger that "I found a mosquito in my dessert." And the manager was reading that book. The waiter apologized again while I was leaving and he meant every word he said. I could feel it. Now, I am feeling guilty that I should not have written my complaint. I am worried that the manager might fire the poor guy or deduct some money from his salary. I want to know whether I did the right thing or I shouldn't have written about it in the book? I am very disturbed thinking about the incident.