I'm afraid I usually just shrug things off and never really complain. However, I have pointed out things that didn't seem right, occasionally, and often when I was so glaringly obviously in the right, I have been compensated.
There is a custom here in Germany on St Martin's day. They have a parade and re-enact the story of St Martin sharing his cape and then little cakes (something like gingerbread men, but without the ginger) are distributed to all the children present. When mine were small, they had to go up to a stall and were handed their "Weckmännl" as they are called, but there were bigger children barging in and collecting huge numbers and hiding them in their jackets and up their jumpers.
The following year I wrote to the local newspaper, saying how I wasn't looking forward to the event, in the name of my children and describing what happens.
That year, after the parade, local dignitaries went around with trays, handing out the cakes, making sure that each child got their fair share.
Result!
I also wrote to a large chemist shop, pointing out that selling nappies and baby food on the first floor, with no lift, made life very difficult for young mothers with small children and prams.
Not long after, the nappies and baby food had been moved downstairs!