The deposit for purchasing a house cannot be refunded once an invoice is issued. The deposit agreement shall take effect from the date of actual payment of the deposit. After the debtor performs its debt, the deposit shall be used against the price or be recovered. If the party that pays the deposit fails to perform its agreed obligations, it has no right to demand the return of the deposit. If the party receiving the deposit fails to perform the agreed debt, it shall return double the deposit. If the deposit cannot be refunded, the invoice cannot be refunded.