Lufthansa — special meal request

Very disappointed with lufthansa service. Travelled on 13th dec in austin to frankfurt and frankfurth to chennai flights.
I called the airways around 10 days earlier and place a special request for vegan and gluten free meals. When i called to check if the meal was confirmed
They told me it was confirmed. When i got into the plane, they combined few dishes from the vegan meal and few from gluten free and said it is your meal.
They had egg in the cake and said this is what u asked for (When isaid vegan food!!). They had no snacks to give me as well. I was almost empty stomach for like 20 to 22 hours.
I dont say they have to cater to every request, but they should not give wrong confirmation if they are not going to give the right food. I could have brought my own food.
I am going to try placing only a vegan meal and check if they give products which contain egg still