Etihad Airways - service deficiency

I travelled from chicago to chennai through etihad on 13th sep 2014. I am a frequent flyer in etihad and pure vegetarian. While I booked the tickets, I have opted for hindu vegetarian meal.in the flight sector from chicago to abhu dhabi they served meal stating that it is a vegetarian. Since the food box was marked with letter v which stands to mention the food served is vegetarian, and the flight attendant told it is vegetarian, I accepted the food and started my first bite. I sensed that there was some thing wrong with the food and requested the flight attendant to validate the food. They checked and confirmed it is non-vegetarian food. While questioned, they told me that it is caterers mistake and requested to raise a complaint with etihad helpdesk. It was horrible experience for me and I couldn't eat any food after that in that flight.. I also understood from the air hostress that several people who requested vegetarian had same experience..

How come a well known reputed carrier can do this to their customers.. Could you please let me know how to take it forward?

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