First, you can complain to the restaurant manager. If you are not satisfied with the result, you can complain to the assistant manager in the hotel lobby. Generally, hotels with more than 4 stars will have lobby managers to deal with guest complaints. If you are not satisfied, you can call the Consumer Association at 123 15 to complain. Most hotels do not want to make a mountain out of a molehill. I'll give you a discount or other discount to offset it.