The house has been transferred, the real estate license is already in your name, and you have gone to the bank to go through the mortgage formalities. Now everything you have to do has been completed according to the contract. This house is actually your house in law, but because the bank didn't lend money and the original landlord didn't get the final payment, it is ok for them not to let you decorate it, but you can't go back on your word, because it is the bank that owes them money, not you.