Were you injured? Did you even eat the pizza? You are entitled to a refund.
By the way, vegan pizza should be illegal--but that's my personal opinion.
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If you did not eat the pizza, yo are limited to getting a refund. Contact the company that makes the pizza and complain. You might get some copons.
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If you have no injury, you have no case. You can get a refund, but with no injury, you are spinning your wheels.
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You could sue under the consumer fraud act for three times the value of the pizza. Maybe get all vegans together who have eaten this accidentally and institute a class action. Probably not worth it. I'd call them up and demand a refund. If you make a big enough stink, I'm sure they will oblige.
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