What should I do if I buy a house with a new property fee and go back on my word after buying a developer?

When buying a house, I promised to pay the property fee, but I didn't admit it.

First of all, you can give up buying a house without paying the deposit. It is the seller's right to pay the property fee, and it is your right to buy or not to buy a house. If you pay the down payment for buying a house, it depends on whether the other party's promise is written on paper. If it is written on paper, it is well documented. Don't worry about breach of contract, you can go through legal procedures if necessary. If you don't write it down on paper, verbally agree and then go back on your word, you may not get the property fee as a gift.