When I was flying from Mumbai to France I pre-ordered vegan food. They forgot to load it to the plain, and then tried to give me an apple and some nuts in stead.

I asked to talk to her "boss" and told him that I paid for vegan food, and that I knew that they must have some more vegan food in the plain than nuts and fruit.

After some time they came to me with a fully vegan meal from "1.st class". It did not taste soo good, but at I was happy to at least get a meal!