Well it is not free in Austria...pretty expensive so they are a paid service. They should ignore minor things, and if big things, just not take it.
And it is usually small misunderstandings of people who try to make everything right. At immigrant places all is mixed, nothing separate and they take it without complain.
Things like that cause avoidable anger. (I am not speaking about people who make it wrong on purpose, I speak about the elderly lady who make a mistake)