The customer is wrong

I ordered soup from a Chinese restaurant which the Mr D system mixed up with the wrong order. They refused to help me insisting that their system is correct and infallibale. Why would I order something I am allergic for? Really?! The help agent kept insisting. I eventually got in my car and went to the restaurant who was incredibly helpful and replaced my order immediately. Next time I will use a differt service as Mr D is obviously not a good service. They have just lost a customer who used them at least twice a week.