A double room for four people for four days. Now the hotel has to make up the difference. Is that so? ?

This is unreasonable. If the hotel wants to make up the difference, it should explain the situation to customers in advance, and customers can make up the difference when they are in love. If the customer doesn't know this situation, you have to charge more. It was more comfortable for two people to live in a double room, but can four people be comfortable? You said you would charge for another room, but that room didn't open and didn't move, and the hotel wouldn't stay out just because there were too many people. Why do hotels charge? If you really want to charge, be sure to tell me in advance.