Twice the Deal Pizza

We ordered a ex large pizza Hawaiian pizza I said no mushrooms we got home and there is mushrooms my friend is allergic to them and we called they said they can't replace it that we would have to pay for another, I told the guy on the phone no mushrooms and they put them on and still refused to re make the pizza even if we brought the other one back, very bad service we had to throw the pizza out and we paid 13$ dollars for the pizza